List of Sonic X episodes

Sonic X is an anime series based on the Sonic the Hedgehog video game series. It originally ran consecutively on Sundays from April 6, 2003 to March 28, 2004 with a total of 52 episodes (collectively known as the Japanese "Series 1"). In Japan, episodes 53–78 ("Series 2") initially went unaired on television, becoming direct-to-video releases. Episodes 53–78 were first broadcast on TV in France and parts of Asia before they aired on UK/US television.

As part of Kids Station's 2020 line-up of programming, as part of a tie-in promotion for the Sonic the Hedgehog film, the network finally began broadcasting the remaining episodes in 2020. This would mark the first time that the episodes would air in any format on Japanese television.

For the English dub produced by 4Kids (which aired on Fox's Saturday morning block FoxBox, later renamed 4Kids TV, from August 23, 2003 to May 6, 2006), episodes 1–52 were referred to as Seasons 1–2, each 26 episodes long, and episodes 53–78 were referred to as Season 3, but the Saga Set DVD releases split the episodes into 6 seasons, each containing 13 episodes. The airdates for TV Tokyo are listed on the left, while the airdates for the 4Kids English dub are on the right. For Season 3, air dates for the Japanese run reflect the first date of Kids Station's broadcasts.

Series overview

Season	Episodes		Originally aired
			First aired	Last aired
1	26		April 6, 2003 (2003-04-06)	September 28, 2003 (2003-09-28)
2	26		October 5, 2003 (2003-10-05)	March 28, 2004 (2004-03-28)
3	26		March 12, 2005 (2005-03-12)	April 18, 2005 (2005-04-18)

Episode list

Season 1: The New World and Chaos Emerald Sagas (2003)

No.	Title	Directed by	Written by	Storyboarded by	Original air date	American air date
1	"The Supersonic Hero Takes the Stage!" ("Chaos Control Freaks") Transliteration: "Chōonsoku hīrō tōjō!" (Japanese: 超音速ヒーロー登場！)	Hajime Kamegaki	Hiro Masaki	Hajime Kamegaki	April 6, 2003 (2003-04-06)	August 23, 2003 (sneak peek) September 6, 2003 (series premiere)
In a battle, Sonic the Hedgehog destroys Doctor Eggman's Energy Amplifier, powered by the seven Chaos Emeralds. This causes an explosion, a result of a phenomenon known as Chaos Control, which sends Sonic; Eggman and his fortress; Rouge the Bat; Cream the Rabbit and her pet Chao Cheese; Miles "Tails" Prower and the biplane he flies, the Tornado 2 (Tornado); Amy Rose; and Knuckles the Echidna to Station Square, a city on Earth. The police try to catch Sonic by deploying the Speed Team, led by Formula One car driver Sam Speed, but he outruns the team and escapes; however, he falls off the road and into the pool of a mansion. Sonic, who cannot swim, is saved by Chris Thorndyke, a young boy who lives there.
2	"Infiltrate Area 99!" ("Sonic to the Rescue") Transliteration: "Sennyū! Eria 99" (Japanese: 潜入！エリア９９)	Keiichirō Furuya	Hiro Masaki	Kazuhide Tomonaga	April 13, 2003 (2003-04-13)	September 13, 2003
Sonic meets Chris' inventor grandfather, Chuck. After finding that Cream and Cheese are being held at Area 99, a military research base, Chris and Chuck help Sonic bust them out, and they reunite with Tails and the Tornado. Meanwhile, Eggman, whose fortress has been sent to a deserted island, schemes to establish an "Eggman Empire" on Earth.
3	"Dr. Eggman's Ambition" ("Missile Wrist Rampage") Transliteration: "Dr. Eggman no yabō" (Japanese: Ｄｒ．エッグマンの野望)	Keiko Oyamada	Hiro Masaki	Toshihiko Masuda	April 20, 2003 (2003-04-20)	September 20, 2003
Eggman deploys his robot E-23 Missile Wrist in an attempt to take over Station Square, but Sonic defeats him with Knuckles and Amy's help. The police try to capture them, but they escape; Amy returns to the Thorndyke mansion with Sonic and co., while Knuckles leaves to be on his own.
4	"Get the Chaos Emerald!" ("Chaos Emerald Chaos") Transliteration: "Kaosu Emerarudo o te ni irero!" (Japanese: カオスエメラルドを手に入れろ！)	Masafumi Satō	Hiro Masaki	Kazuyoshi Yokota	April 27, 2003 (2003-04-27)	September 27, 2003
The President and the government begin spying operations on Eggman, and install an agent, Mr. Stewart, as Chris' elementary school teacher to keep tabs on him. The heroes theorize that if they can gather the seven Chaos Emeralds again, they can send Sonic and the others back to their world. The green Chaos Emerald is discovered at a construction site; Eggman and Chris fight over it, and Chris successfully recovers the green Emerald.
5	"Clash!! Sonic vs. Knuckles" ("Cracking Knuckles") Transliteration: "Gekitotsu!! Sonikku vs Nakkuruzu" (Japanese: 激突！！ソニックｖｓナックルズ)	Keiichirō Furuya	Kiyoko Yoshimura	Kazuhide Tomonaga	May 4, 2003 (2003-05-04)	October 4, 2003
Knuckles is anxious to return to his world so he can guard the Master Emerald. Eggman falsely tells Knuckles that Sonic intentionally caused Chaos Control and is undermining Eggman's efforts to go home so he can live out the rest of his life peacefully. Enraged, Knuckles challenges Sonic to a fight. Eggman uses the fight as a distraction to capture Chris, Amy, and Tails. When Knuckles realizes he fell for a ruse, he helps Sonic defeat Eggman.
6	"Fierce Battle! School Wars" ("Techno-Teacher") Transliteration: "Nessen! Sukūru wōzu" (Japanese: 熱戦！スクール・ウォーズ)	Naoyuki Kuzuya	Yoshio Urasawa	Kōji Hōri	May 11, 2003 (2003-05-11)	October 11, 2003
Eggman sends E-51 Intelligente, a teacher robot, to indoctrinate Chris' class, but Sonic thwarts his plan. Chris' parents—Nelson, a wealthy company president, and Lindsey, a famous actress—return home after a long absence.
7	"Giant Free-For-All! Chris' House Party" ("Party Hardly") Transliteration: "Daikonsen! Kurisu no hōmu pāti" (Japanese: 大混戦！クリスのホームパーティ)	Keiko Oyamada	Chinatsu Hōjō	Toshihiko Masuda	May 18, 2003 (2003-05-18)	October 18, 2003
Nelson and Lindsey go back to work, with Chris and his mother both being unhappy about Chris' parents' absences. Cream misses her mother. Sam Speed is revealed to be Chris' uncle. The Thorndykes' maid and chef, Ella, and butler, Mr. Tanaka, learn about the animals.
8	"Emergency Takeoff! X-Tornado" ("Satellite Swindle") Transliteration: "Kinkyū hasshin! X Torunēdo" (Japanese: 緊急発進！Ｘトルネード)	Makoto Bessho	Masahiko Shiraishi	Makoto Bessho	May 25, 2003 (2003-05-25)	October 25, 2003
Eggman uses a rocket ship, E-90 Super Sweeper, to suck up satellites for parts. Sonic and Tails use the Tornado to fly to it, but are unable to keep up. Tails and Chuck convert the Tornado into the more powerful X-Tornado, powered by the green Chaos Emerald, and the team destroys Super Sweeper.
9	"Amy at the Beach" ("The Last Resort") Transliteration: "Nagisa no Emī" (Japanese: 渚のエミー)	Keiichirō Furuya	Kiyoko Yoshimura	Kazuhide Tomonaga	June 1, 2003 (2003-06-01)	November 1, 2003
While Chris attends the grand opening of "Hotel de Blanc" as a representative of the Thorndyke family, Amy, Tails, Cream, and Cheese visit the Thorndykes' private beach villa. Sonic stays behind due to his inability to swim and distaste for the ocean. Amy, who has a crush on Sonic, makes a special charm that supposedly improves swimming ability as a gift for him. Eggman destroys Hotel de Blanc and builds a theme park in its place. Sonic comes to stop Eggman, but he is saved by Amy after Eggman uses Sonic's weakness against him. An Eggman robot breaks Amy's charm, causing her to enter a fit of rage; she is flung into the ocean, and Sonic reluctantly dives in to save her. When Amy comes to, she grieves the loss of the charm but vows to make another. Sonic is then seen looking out over the sea, holding a repaired charm.
10	"Fierce Fight! Sonic Baseball Team" ("Unfair Ball") Transliteration: "Gekitō! Sonikku yakyūgun" (Japanese: 激闘！ソニック野球軍)	Masafumi Satō	Mutsumi Mikuni	Masafumi Satō	June 8, 2003 (2003-06-08)	November 8, 2003
As Tails cruises in the X-Tornado, the green Chaos Emerald draws him to Diamond Stadium, a baseball stadium. Its groundskeeper, Alfred Butler, tells Tails that Diamond Stadium will soon be demolished because its home team is moving to an indoor stadium. Alfred has also found the cyan Chaos Emerald at the stadium. Eggman challenges Sonic and co. to a baseball game against his robots for both Emeralds. As the two teams play, the stands fill with spectators; inspired, the team's manager, Elmer Johnson, offers to move Diamond Stadium's turf to the team's new stadium, which Alfred happily agrees to. Sonic's team ultimately defeats Eggman's, but he steals the cyan Emerald anyway and escapes.
11	"The Beautiful, Mysterious Thief, Rouge" ("Fly Spy") Transliteration: "Utsukushiki kaitō Rūju" (Japanese: 美しき怪盗ルージュ)	Keiko Oyamada	Hiro Masaki	Toshihiko Masuda	June 15, 2003 (2003-06-15)	November 15, 2003
The President seeks Sonic's help to attack Eggman's fortress. They set a trap for him under guise of a Chaos Emerald, but end up catching Rouge the Bat instead, who has become a serial jewel thief. In exchange for amnesty, the President gives Rouge a job as an agent instead; she accepts, reasoning that being an agent will give her information about the Chaos Emeralds, which she wants for herself. She and an agent named Topaz go on a mission to infiltrate Eggman's fortress. Despite distrust of Rouge, they gain information about the fortress and Rouge saves Topaz from Eggman's robot. Meanwhile, Chris introduces his friend Danny to Sonic and the others.
12	"Assault on Eggman's Base! (Part I)" ("Beating Eggman, Part 1") Transliteration: "Egguman kichi sōkōgeki! (zenpen)" (Japanese: エッグマン基地 総攻撃！（前編）)	Naoyuki Kuzuya	Hiro Masaki	Naoyuki Kuzuya	June 22, 2003 (2003-06-22)	November 22, 2003
Chris, Tails, Amy, and Chris' friend Frances detect a Chaos Emerald underground in a cornfield. While they dig for it, Eggman arrives to take it for himself; the heroes try to defeat his wind-blowing robot, E-35 Funfun, by transforming the X-Tornado into the X-Cyclone, but they struggle. Mr. Stewart, who has been tailing Chris and co., calls the Thorndyke residence, and Sonic rushes to their aid. Meanwhile, the President sends Rouge and Topaz inside Eggman's fortress again while the navy and air force barrage it from outside, in the hopes of stopping him once and for all.
13	"Assault on Eggman's Base! (Part II)" ("Beating Eggman, Part 2") Transliteration: "Egguman kichi sōkōgeki! (kōhen)" (Japanese: エッグマン基地 総攻撃！（後編）)	Eiichi Kuboyama	Hiro Masaki	Satoshi Kimura	June 29, 2003 (2003-06-29)	November 29, 2003
Sonic destroys Funfun, but Eggman escapes with the yellow Chaos Emerald. Sonic, Tails, Amy, Chris, and Frances fly to Eggman's fortress, where the attack is in progress. Knuckles also hitches a ride on an air force plane, and finds Rouge and Topaz. They plant an explosive charge to destroy the fortress, but get locked inside while the timer runs. Sonic takes the cyan and yellow Chaos Emeralds from Eggman's robot and uses their power to break out Rouge, Topaz, and Knuckles. The heroes escape and the charge detonates, demolishing Eggman's fortress. The people of Station Square, watching the attack on television, celebrate the victory as they cheer Sonic's name.
14	"Chase After the Hero, Sonic!" ("That's What Friends Are For") Transliteration: "Eiyū Sonikku o oe!" (Japanese: 英雄ソニックを追え！)	Keiko Oyamada	Yoshio Urasawa	Kenji Yazaki	July 6, 2003 (2003-07-06)	December 6, 2003
Since the public largely gives Sonic credit for defeating Eggman, the President's aide organizes a party for Sonic and the press, hoping to associate the two in the media so that the President can win reelection. Sonic does not attend the party with his friends; he promised Chris' physically disabled classmate Helen to take her to an island to see flowers, which her father is not able to do because he is too busy working to support her. The President's aide deploys the military to find Sonic and bring him to the party, and Sonic and Helen's excursion becomes an exciting chase as Sonic pushes her wheelchair. After escaping by stealing a helicopter, Sonic and Helen go to the President's party and Sonic shakes his hand, but the reporters are unable to take pictures because they are intensely drunk (in the English version, they are simply tired from the long wait). Later, as Helen tells the story of her first adventure to her parents, they commit to spending more time with her.
15	"Attack of the Mobile Fortress, Egg Fort!" ("Skirmish in the Sky") Transliteration: "Idōyōsai Eggu Fōto shūrai!" (Japanese: 移動要塞エッグフォート襲来！)	Toshikiyo Ishikawa	Kiyoko Yoshimura	Toshihiko Masuda	July 13, 2003 (2003-07-13)	December 13, 2003
Chris and Ella take Tails, Amy, Cream, and Cheese shopping in Station Square since they are now publicly-known figures, but they find it difficult to do things without drawing attention. Meanwhile, at the wreckage of Eggman's fortress, an airship he calls the Egg Fort emerges and terrorizes the city. Sonic appears, but is unable to reach the Egg Fort. Chris' group escapes the city, aided by Mr. Stewart, Sam Speed, and Mr. Tanaka, and bring the X-Tornado to Sonic. Sonic destroys the Egg Fort and it falls into the ocean, but the heroes assume it will be back.
16	"Aim for It! The Sunken Ship of the Southern Sea" ("Depths of Danger") Transliteration: "Mezase! Nankai no chinbotsusen" (Japanese: 目指せ！南海の沈没船)	Masafumi Satō	Chinatsu Hōjō	Masafumi Satō	July 20, 2003 (2003-07-20)	January 17, 2004
As thanks for their service to the country, the government issues Social Security numbers and passports to the animals, as well as a pilot's license and various other permits for Tails. Chris and the animals travel to the Sapphire Sea for a vacation, but detect a fourth Chaos Emerald under the water. When they go to a store to get scuba diving gear and a boat to look for the Emerald, they learn a legend about a sunken ship with treasure inside. As the heroes dive, they find the blue Emerald as part of the ship's sunken treasure. Meanwhile, as Eggman learns about Sonic's vacation, he emerges from the ocean to ruin it; Sonic defeats him with Sam Speed's help, but the sunken ship is buried under rocks during the battle. When they go to return the diving equipment, they tell the owner that the ship was buried, but he is simply glad that the legend was true, as it was his grandfather's boat.
17	"Knuckles! Fist of Fury" ("The Adventures of Knuckles and Hawk") Transliteration: "Nakkuruzu! Ikari no tekken" (Japanese: ナックルズ！怒りの鉄拳)	Hiroshi Kimura	Masahiko Shiraishi	Toshihiko Masuda	July 27, 2003 (2003-07-27)	January 24, 2004
One day, Knuckles befriends a fellow treasure hunter named Hawk. Some time later, Hawk calls Knuckles to "Oriental City", where he believe he has found a Chaos Emerald. Knuckles and Hawk dig up the red Emerald's hiding place in the subway, but they get into a fight with Eggman's robot, E-91 Lady Ninja, for it. During the battle, the Emerald is buried under a pile of heavy rock; Knuckles retrieves the "Shovel Claws" to dig it out again. As Knuckles and Hawk escape the city with the Emerald, they are pursued by Lady Ninja and Rouge. After destroying Lady Ninja, Knuckles leaves Hawk. As he floats away on a boat, the red Emerald gives Knuckles a cryptic vision of the Master Emerald. Note: The episode's Japanese title is a reference to the 1972 Hong Kong martial arts film of the same name.
18	"Huge Shoot-out on the Savannah!" ("The Dam Scam") Transliteration: "Sabanna no dai kettō!" (Japanese: サバンナの大決闘！)	Makoto Moriwaki	Hiro Masaki	Naoyuki Kuzuya	August 3, 2003 (2003-08-03)	January 31, 2004
After a battle in the air, Sonic, Tails, Chris, and Eggman crash-land in Africa. Tails and Chris find a construction company building a dam in the middle of the savanna. To help the animals, they get the people of a nearby city to picket against the dam's construction, forcing it to close. Meanwhile, Sonic battles Eggman's ape robot, E-65 Gorru-Gaooh; Eggman and Gorru-Gaooh inadvertently destroy the construction site and thwart the construction manager's further schemes before Sonic defeats Eggman and the managers are arrested.
19	"The Ghost of the Old Castle, King Boom Boo" ("Sonic's Scream Test") Transliteration: "Kojō no bōrei Kingu Būbu" (Japanese: 古城の亡霊キングブーブ)	Keiko Oyamada & Sim Sang-il	Hiro Masaki	Toshihiko Masuda	August 10, 2003 (2003-08-10)	February 7, 2004
The heroes visit a castle to watch Lindsey film a movie. When a cameraman disturbs an hourglass-shaped stone from a pedestal, ghosts appear and kidnap several people, leaving only Chris and Amy. They discover an underground chamber under the pedestal, and venture down to where the people are being kept. The leader of the ghosts, King Boom Boo, mimics Sonic's voice, tricking Amy into placing the hourglass into a slot and strengthening him. Chris flips the hourglass, freeing the kidnapped people and allowing Sonic and Amy to defeat the ghosts; all the heroes escape, and they seal off the underground chamber. King Boom Boo is based on the same boss that Knuckles fought in Sonic Adventure 2.
20	"Departure! Egg Fort II" ("Cruise Blues") Transliteration: "Shutsugeki! Eggu Fōto II" (Japanese: 出撃！エッグフォートII)	Nana Harada	Hiro Masaki	Hajime Kamegaki	August 17, 2003 (2003-08-17)	February 14, 2004
The heroes go on vacation on a cruise ship. Sonic struggles to relax without an open space to run in, so Nelson sends a group of senior citizens to help him learn to slow down. Meanwhile, Eggman abandons the Egg Fort and debuts the Egg Fort II. He sends his robot courier, Bokkun, to announce it at the Thorndyke mansion, and he blows up a bomb in Ella's face. Eggman finds the cruise ship, but before Sonic can fight him, an enraged Ella arrives in the X-Tornado to get rid of him personally. Tails asks Sonic if he wants to leave the cruise early, but Sonic decides to stay and relax instead.
21	"Speed Match! Sonic vs. Sam" ("Fast Friends") Transliteration: "Supīdo shōbu! Sonikku vs Samu" (Japanese: スピード勝負！ソニックｖｓサム)	Yukio Okazaki	Yoshio Urasawa	Toshihiko Masuda	August 24, 2003 (2003-08-24)	February 21, 2004
Sam Speed challenges Sonic to a race with a new car, but Sonic is not interested. The President's aide, intending to use the race as another publicity stunt for the President, convinces Eggman to persuade Sonic, so he sends a kissing robot that will kiss Sonic if he doesn't race, and Sonic finally agrees. Sonic and Sam have a very close race, but Sonic ultimately wins. The President is running late at a meeting, so the President's aide intends to take his place in the press photos so that he can become President himself; however, he receives a call notifying him that he has been fired from his position for conspiring with Eggman.
22	"Summer Vacation - Chao Observation Diary" ("Little Chao Lost") Transliteration: "Natsuyasumi Chao~ na kansatsu nikki" (Japanese: 夏休み・チャオ〜な観察日記)	Masafumi Satō	Kiyoko Yoshimura	Kōichi Sasaki	August 31, 2003 (2003-08-31)	February 28, 2004
Chris, Danny, Frances, Mr. Stewart, and the animals camp with Mr. Tanaka near his Japanese hometown for summer break. After Cheese is swept away by a river current, the heroes discover a Chao colony in a secluded area. Meanwhile, on vacation, Eggman's mecha falls due to the soft terrain, dirtying the river. This endangers the Chao, who must live in clean water. After exploring the town and enjoying his fame, Sonic destroys Eggman's mecha and rescues the Chao habitat by running around the water and blowing the dirt out.
23	"Mayhem! The Sixth Chaos Emerald" ("Emerald Anniversary") Transliteration: "Daikonran! 6 Kaosu Emerarudo" (Japanese: 大混乱！６カオスエメラルド)	Keiko Oyamada & Sim Sang-il	Chinatsu Hōjō	Toshihiko Masuda	September 7, 2003 (2003-09-07)	March 6, 2004
Nelson purchases a ring of the purple Chaos Emerald, intending to give it to Lindsey for their wedding anniversary. The heroes travel to "Filmdom City" to see Nelson present the ring to Lindsey, but the Emerald is also pursued by Rouge and Topaz and Eggman. Sonic, Knuckles, and Eggman fight across several film sets, but ultimately Eggman escapes with the Emerald. Despite the loss of the ring, the heroes celebrate the Thorndykes' anniversary.
24	"Runaway Sonic! Big Capture Operation" ("How to Catch a Hedgehog") Transliteration: "Bōsō Sonikku! Hokaku daisakusen" (Japanese: 暴走ソニック！捕獲大作戦)	Makoto Moriwaki	Masahiko Shiraishi	Kōji Hōri	September 14, 2003 (2003-09-14)	March 13, 2004
After saving Amy from a Eggman robot, Sonic gets a circuit board from it lodged in his ear, forcing him to run without stopping. He runs to the badlands so as to not endanger the city. Over the next two days, Sonic's friends try various schemes to trap him and stop him from running, but they all fail. Eventually, they lead him back to where he fought the robot, and after saving Amy from it again, the board comes loose, allowing him to come to a stop.
25	"The Last Chaos Emerald" ("A Dastardly Deed") Transliteration: "Saigo no Kaosu Emerarudo" (Japanese: 最後のカオスエメラルド)	Yukio Okazaki	Hiro Masaki	Toshihiko Masuda	September 21, 2003 (2003-09-21)	March 20, 2004
Sonic and co. hold four Chaos Emeralds, and Knuckles and Eggman each have one. Chris is torn on whether he wants Sonic and friends to return to their world, or if he wants them to stay. Knuckles realizes they can't do Chaos Control if the Emeralds are separate, so he takes Chris to make a deal with Eggman. As part of the deal, Chris takes the Emeralds without Sonic knowing, and he and Knuckles give their Emeralds to Eggman. When his robot, E-77 Lucky, finds the white final Emerald, Eggman captures Chris and takes off in the Egg Fort II.
26	"Birth! Super Sonic" ("Countdown to Chaos") Transliteration: "Tanjō! Sūpā Sonikku" (Japanese: 誕生！スーパーソニック)	Hajime Kamegaki	Hiro Masaki	Hajime Kamegaki	September 28, 2003 (2003-09-28)	March 27, 2004
Sonic reaches the Egg Fort II and recovers the white Chaos Emerald from Lucky. The Egg Fort II turns into a large robot. Sonic loses badly in a fight against it, and it flings him into the sea. Chris breaks free from the bolts holding him to the wall in the control room and grabs the six Emeralds, intending to avert Chaos Control. Chris also falls into the sea; he is saved by Rouge, but the Emeralds fall into the water. There, the six Emeralds react with the one Sonic holds, transforming him into Super Sonic. After Super Sonic destroys the Egg Fort II, Chaos Control occurs and another burst of light appears. Chris cries that Sonic will leave, but when the light clears up, Sonic appears in front of Chris, showing they are still together. The original Japanese TV broadcast uses an insert song "Kotoba ni Dekinai" by OFF COURSE, while the home video release uses an instrumental of "The Shining Road".

Season 2: The Chaos, Shadow, Egg Moon, Emerl, and Homebound Sagas (2003–04)

No. overall	No. in season	Title	Directed by	Written by	Storyboarded by	Original air date	American air date
27	1	"The Beginning of the Disaster" ("Pure Chaos") Transliteration: "Wazawai no hajimari" (Japanese: 災いのはじまり)	Kazuyoshi Yokota	Kiyoko Yoshimura	Kazuyoshi Yokota	October 5, 2003 (2003-10-05)	September 18, 2004
Chaos Control did not send Sonic and friends back to their world, but instead brought more elements from Sonic's world to Earth, including the floating Angel Island where the Master Emerald resides. Six months later, Eggman has been quiet, secretly developing an E-100 Series of robots—including E-101 Beta, E-102 Gamma, E-103 Delta, and E-104 Epsilon, each powered by a small animal—on his new ship, the Egg Carrier. Big the Cat discovers the purple Chaos Emerald; his pet (non-anthropomorphic) frog, Froggy, swallows a blue liquid and steals the Emerald before running away. Big comes to Chris, Cream, and Cheese for assistance in finding him. During their search, they encounter the blue liquid, which forms into Chaos, a humanoid monster which gets stronger upon consuming Chaos Emeralds. Sonic arrives after a solo journey, and Knuckles comes looking for the whereabouts of the missing Master Emerald. Eggman appears and reveals his plan to use Chaos to take over the world. He feeds Chaos both the yellow and red Emeralds; Sonic and Knuckles are barely able to defeat him. Chaos escapes with Eggman. This episode begins an adaptation of the video game Sonic Adventure.
28	2	"The Mysterious Lifeform, Chaos" ("A Chaotic Day") Transliteration: "Nazo no seimeitai Kaosu" (Japanese: 謎の生命体カオス)	Masafumi Satō	Kiyoko Yoshimura	Kazuhito Kikuchi	October 12, 2003 (2003-10-12)	September 25, 2004
Sonic enlists Tails' help to find the Chaos Emeralds before Eggman. They discover the cyan Emerald, but Eggman arrives and steals it, as well as Tails' green one. He feeds them both to Chaos, but Sonic is able to defeat him. Meanwhile, Knuckles finds a shard of the shattered Master Emerald, which gives him a vision of an ancient echidna tribe in front of the Master Emerald; in it, a young girl, Tikal, pleads for her father, the tribal leader Pachacamac, to stop warring with other countries for their Chaos Emeralds, but he refuses. Amy, Cream, and Cheese meet a bird with a Chaos Emerald around her neck, which they name Lily, but Eggman's E-100 ZERO abducts Amy and Lily.
29	3	"Amy the Captive" ("A Robot Rebels") Transliteration: "Toraware no Emī" (Japanese: 囚われのエミー)	Keiko Oyamada & Sim Sang-il	Chinatsu Hōjō	Toshihiko Masuda	October 19, 2003 (2003-10-19)	October 2, 2004
Big and Chris fish up the missing Froggy, but Gamma steals him and takes him to the Egg Carrier; the two sneak on board. Eggman takes Froggy, and dismisses the other three E-100s. He instructs Gamma to bring him Lily; however, when it sees Beta being disassembled and Amy pleads for Gamma to be kind, he frees Amy and Lily from their cell, allowing them to escape. Meanwhile, Knuckles finds more Master Emerald shards and brings them to Angel Island, although some shards are still missing. He sees another vision in which Tikal learns that the Master Emerald controls the seven Chaos Emeralds. Sonic and Tails meet up with Knuckles in the X-Tornado, and they make a crash landing on the Egg Carrier to rescue Amy and Lily.
30	4	"Battle on the Egg Carrier" ("Heads Up, Tails!") Transliteration: "Eggu Kyaria no tatakai" (Japanese: エッグキャリアの戦い)	Shigeru Yazaki	Yoshio Urasawa	Hiro Masaki	October 26, 2003 (2003-10-26)	October 9, 2004
On the ship, Eggman takes the blue Chaos Emerald from Lily. Sonic battles Gamma, but Amy forbids him to destroy him. Tails takes Amy and Lily back to the ground, and Amy vows to find Lily's family, who are still captured by Eggman. Meanwhile, Knuckles finds the remaining Master Emerald shards and sees a vision in which Tikal tells Knuckles she failed to stop her father. Knuckles helps Sonic defeat Chaos, now with six Chaos Emeralds. Eggman tries to flee, but Sonic follows; he is dropped to the ground, where he finds an overgrown temple. Big and Chris rescue Froggy after Eggman takes his Emerald, and they and Knuckles, who retrieves the Chaos Emeralds, return to the ground; Knuckles goes to repair the Master Emerald, and Big and Froggy return home. Back in Station Square, Tails defuses an Eggman missile and learns to be confident without Sonic, earning cheers from the civilians.
31	5	"Gamma the Wanderer" ("Revenge of the Robot") Transliteration: "Sasurai no Ganma" (Japanese: さすらいのガンマ)	Makoto Moriwaki	Masahiko Shiraishi	Makoto Moriwaki	November 2, 2003 (2003-11-02)	October 16, 2004
Gamma erases Eggman as his master, and shuts down Delta and Epsilon to free the animals trapped inside. He returns to the Egg Carrier to do the same to Beta, while Amy and Lily also return to find Lily's family. Gamma defeats an upgraded Beta, called Kai, and then self-destructs, revealing Lily's two family members. Amy tearfully says goodbye to Gamma and promises they will be friends forever. Meanwhile, Sonic enters the temple and sees a vision of Tikal running toward the Master Emerald to stop her father.
32	6	"The Scream of Perfect Chaos" ("Flood Fight") Transliteration: "Pāfekuto Kaosu no sakebi" (Japanese: パーフェクトカオスの叫び)	Nana Harada	Masahiko Shiraishi	Toshiki Hirano	November 9, 2003 (2003-11-09)	October 23, 2004
Chaos finally breaks free of Eggman's control. Sonic and Knuckles see a vision of Chaos appearing and Tikal praying to the Master Emerald for help. Chris brings the white seventh Chaos Emerald to Knuckles, inadvertently gathering all seven Emeralds, which are then stolen by Chaos. Perfect Chaos, a massive monster, destroys the center of Station Square. Sonic and co. arrive, and the spirit of Tikal appears, revealing she has kept Chaos dormant with her sadness until Eggman got to him. Perfect Chaos spits out the Emeralds, which have been drained of their energy; however, the love of Sonic, his friends, and the Station Square populace restores the Emeralds' power, transforming Sonic into Super Sonic. Super Sonic fights Perfect Chaos and purifies him, causing him to revert to his base form and allowing him and Tikal to finally pass on. This episode concludes the Sonic Adventure adaptation.
33	7	"The Mystery of Project Shadow" ("Project: Shadow") Transliteration: "Purojekuto Shadō no nazo" (Japanese: プロジェクトシャドウの謎)	Keiko Oyamada & Eom Sang-yong	Hiro Masaki	Toshihiko Masuda	November 16, 2003 (2003-11-16)	October 30, 2004
Eggman hacks into a Guardian Units of Nations (G.U.N.) database and finds records of his late grandfather, Professor Gerald Robotnik, meaning Eggman was born on Earth; he concludes that the human world and Sonic's world are in parallel universes. He additionally finds records of a 50-year-old secret "Project Shadow". The government learns about the hack, and Rouge and Topaz steal the Master Emerald and the blue Chaos Emerald to lure Eggman so they can keep him under surveillance. Mr. Stewart offers to help reporter Scarlet Garcia learn about Project Shadow. Eggman breaks into G.U.N. and finds the secret project, revealing Shadow the Hedgehog. This episode begins an adaptation of the video game Sonic Adventure 2.
34	8	"Sonic the Fugitive" ("Shadow Knows") Transliteration: "Tōbōsha Sonikku" (Japanese: 逃亡者ソニック)	Masafumi Satō	Masahiko Shiraishi	Kazuhito Kikuchi	November 23, 2003 (2003-11-23)	November 6, 2004
Shadow pledges alliegance to Eggman for freeing him. The government pursues Sonic, mistaking Shadow for him and believing that Sonic is responsible for freeing Shadow. Eventually, Sonic and Shadow meet; Sonic learns Shadow can use Chaos Control with one Chaos Emerald to teleport. Shadow leaves when the police come, and Sonic turns himself in, telling Chris that he will see him again soon. Shadow tells Eggman that to use a powerful weapon called the Eclipse Cannon, they will need all seven Chaos Emeralds; Rouge brings the blue Emerald to Eggman and says she can help him find more if he cooperates. Chris and Mr. Tanaka travel to Prison Island, where Sonic is being held.
35	9	"Escape from Prison Island" ("Sonic's Big Break") Transliteration: "Purizun Airando kara no dasshutsu" (Japanese: プリズンアイランドからの脱出)	Ichizō Fukushima	Chinatsu Hōjō	Jōhei Matsuura	November 30, 2003 (2003-11-30)	November 13, 2004
Tails and Amy come to Prison Island to rescue Sonic in the X-Tornado. Amy comes to free Sonic in his isolation cell; he reveals that he turned himself in to get information about Shadow. The two bust out of the high-security prison. Meanwhile, Eggman brings Shadow and Rouge to Prison Island to get the Chaos Emeralds held there, as well as to detonate the island and defeat Sonic for good. Rouge finds three Chaos Emeralds, but gets locked inside the building as the timed charges count down. After a fight with Sonic, Shadow uses Chaos Control to retrieve Rouge and the Emeralds, but Chris finds Shadow and mistakes him for Sonic, causing Chaos Control to bring Chris along. Chris begs Shadow to help him save Sonic; Chris reminds Shadow of a young girl named Maria, and he reluctantly teleports Chris along with himself and Rouge just before the island explodes.
36	10	"Threat from Outer Space" ("Shadow World") Transliteration: "Uchū kara no kyōhaku" (Japanese: 宇宙からの脅迫)	Shigeru Yazaki	Hiro Masaki	Seiji Okuda	December 7, 2003 (2003-12-07)	November 20, 2004
Shadow, Rouge, and Chris teleport to the "Space Colony ARK", Shadow's former home and the location of the Eclipse Cannon. Shadow painfully remembers the events of 50 years ago. Maria Robotnik, Gerald's granddaugher, was Shadow's friend on the ARK, but was shot by G.U.N. when she helped Shadow escape to Earth. Before she died, she asked Shadow to do something; he does not remember what, but assumes it was to get revenge for her death. With six Chaos Emeralds, Eggman fires the Eclipse Cannon at the Moon as a warning shot, destroying half of it; he promises to use the Cannon to destroy Earth if the President refuses to submit. Meanwhile, the heroes prepare to fly to the ARK. Since they only possess the yellow Emerald but need two for the X-Tornado to reach the ARK, Tails creates a less-powerful imperfect replica of the Emerald. The heroes find a pyramid in the desert which contains a rocket ship; they decide to use the rocket instead of the X-Tornado because it seats more people.
37	11	"Battle on the Space Colony ARK" ("Robotnik's Revenge") Transliteration: "Supēsu koronī Āku no tatakai" (Japanese: スペースコロニー・アークの戦い)	Mamoru Enomoto	Kiyoko Yoshimura	Toshihiko Masuda	December 14, 2003 (2003-12-14)	November 27, 2004
The heroes arrive at the Space Colony ARK. Tails gives Sonic the fake Chaos Emerald and says it may be able to stop the Eclipse Cannon by absorbing the Emeralds' energy and exploding. Eggman catches Sonic in a capsule with the fake Emerald and drops it toward Earth, exploding on impact; however, Sonic is able to escape by using Chaos Control. Meanwhile, Knuckles retrieves the Master Emerald after a fight with Rouge which ends with them on friendly terms. Sonic tries to get to the Cannon's core with the fake Emerald, contested by Shadow. Eggman tries to fire the Cannon, but it fizzles out and a video message from Gerald appears, saying the ARK will collide with Earth in 28 minutes, destroying the world as revenge for Maria. Meanwhile, after finding several dead ends, Mr. Stewart and Scarlet Garcia meet with a former G.U.N. operative; he regretfully tells the story of the day he killed Maria, while men in black attack in an attempt to preserve the Project Shadow cover-up.
38	12	"Maria's Wish, Everyone's Wish" ("Showdown In Space") Transliteration: "Maria no negai, minna no negai" (Japanese: マリアの願い、みんなの願い)	Nana Harada	Kiyoko Yoshimura	Toshiki Hirano	December 21, 2003 (2003-12-21)	December 4, 2004
In the video, after Gerald finishes his message, he is executed by firing squad. Chris convinces Shadow to save Earth when Shadow remembers that Maria's wish was for him to help Earth and its people reach their potential. The heroes and Eggman form a plan to use the Master Emerald to neutralize the Chaos Emeralds. They battle the Biolizard, a Project Shadow prototype, and neutralize the Emeralds; however, the Biolizard attaches itself to the Space Colony ARK to destroy Earth. Sonic and Shadow use the Emeralds to become Super Sonic and Super Shadow to stop the ARK. As they battle the Biolizard in space, Scarlet Garcia broadcasts a message explaining the ARK, and the people cheer for Sonic and Shadow. The two hedgehogs stop the ARK, but Shadow doesn't make it back; as the group returns to Earth, Sonic says farewell to him. This episode concludes the Sonic Adventure 2 adaptation.
39	13	"The Chaotix Detective Agency" ("Defective Detectives") Transliteration: "Kaotikusu tantei jimusho" (Japanese: カオティクス探偵事務所)	Makoto Moriwaki	Yoshio Urasawa	Hajime Kamegaki	December 28, 2003 (2003-12-28)	December 11, 2004
Sonic and friends' world and the human world have merged. Vector, Espio, and Charmy show up and start wandering the streets, looking for Cream. Meanwhile, Eggman reforms and claims he will repair the destroyed moon himself. This episode aired two days before the release of the video game Sonic Heroes in Japan, which marked Vector's, Espio's, and Charmy's first major game appearances since Knuckles' Chaotix.
40	14	"Eggman Company" ("Sunblock Solution") Transliteration: "Egguman kabushikigaisha" (Japanese: エッグマン株式会社)	Masafumi Satō	Hiro Masaki	Matsuo Asami	January 4, 2004 (2004-01-04)	December 18, 2004
Suddenly, Eggman's artificial moon covers the sun and the world is enveloped in darkness. The reformed Eggman proposes a sunlight supply service to the president, which is well received by the citizens, but it is a ruse by Eggman.
41	15	"Give Us the Light!" ("Eggman for President") Transliteration: "Hikari o warera ni!" (Japanese: 光をわれらに！)	Mamoru Enomoto	Hiro Masaki	Kiyoshi Egami	January 11, 2004 (2004-01-11)	January 22, 2005
Citizens' criticism of Sonic grows as he begins to interfere with Eggman's sunlight supply service. Chris, unable to defend him confidently, goes to stop Sonic, but learns that sunlight has actually been blocked due to Eggman's ambitions.
42	16	"Amy's Love Went Away?!" ("A Date to Forget") Transliteration: "Emī ai no tōhikō!?" (Japanese: エミー愛の逃避行！？)	Shigeru Yazaki	Kiyoko Yoshimura	Seiji Okuda	January 18, 2004 (2004-01-18)	January 29, 2005
Amy is supposed to have a date with Sonic, but he never shows up. Angry, she decides to go for a drive with Sam Speed, who happens to be there. There, however, she encounters one of Eggman's robots.
43	17	"Huge Home Electronics Panic!!" ("Mean Machines") Transliteration: "Kaden daipanikku!!" (Japanese: 家電大パニック！！)	Jōhei Matsuura	Hiro Masaki	Jōhei Matsuura	January 25, 2004 (2004-01-25)	February 5, 2005
While Eggman and his henchmen in prison are forced to work at an electronics factory, they plant mysterious chips in many of the products. The result is that home appliances all over the city now move on their own and attack people, causing mayhem.
44	18	"The Ridiculously Epic Spy Operation" ("Sewer Search") Transliteration: "Okashi na okashi na supai daisakusen" (Japanese: おかしなおかしなスパイ大作戦)	Nana Harada	Yoshio Urasawa	Toshiki Hirano	February 1, 2004 (2004-02-01)	February 12, 2005
Stewart has begun a search to catch Eggman, who has escaped from prison. However, Chris and his friends find him and decide to search together.
45	19	"Sonic Battle – Face Off!" ("Prize Fights") Transliteration: "Sonikku Batoru kaisai!!" (Japanese: ソニックバトル・開催！！)	Kenichi Maejima	Hiro Masaki & Chinatsu Hōjō	Masanori Mizuhara	February 8, 2004 (2004-02-08)	February 19, 2005
As part of the project to capture Eggman, the President proposes a martial arts tournament with a Chaos Emerald at stake. Sonic, Knuckles, Chris, and even Emerl are to participate.
46	20	"Sonic Battle – Finals!!" ("A Wild Win") Transliteration: "Sonikku Batoru kesshō!!" (Japanese: ソニックバトル・決勝！！)	Kazuyoshi Yokota	Hiro Masaki & Chinatsu Hōjō	Kazuhito Kikuchi	February 15, 2004 (2004-02-15)	February 26, 2005
It is time for the finals. However, Emerl, reacting to the Chaos Emerald, begins to run amok, and everyone challenges him to a battle to stop him.
47	21	"The Great Showdown at Latitude Zero!!" ("Map Of Mayhem") Transliteration: "Ido 0 daikessen!!" (Japanese: 緯度０大決戦！！)	Makoto Moriwaki	Masahiko Shiraishi	Makoto Moriwaki	February 22, 2004 (2004-02-22)	March 5, 2005
Eggman claims that he will use his giant battleship to stimulate the "belly button of the world," where submarine volcanic chains run through, and destroy the planet. Sonic and his friends try to stop him. The episode's Japanese title is very similar to the Japanese title of the 1969 sci-fi film Latitude Zero and there are several homages to the movie throughout the episode itself.
48	22	"Sonic vs. The Underground Monsters" ("The Volcanic Venture") Transliteration: "Sonikku tai chitei kaijū" (Japanese: ソニック対地底怪獣)	Mihiro Yamaguchi	Masahiko Shiraishi	Seiji Okuda	February 29, 2004 (2004-02-29)	March 12, 2005
Eggman escapes into the crater of a volcanic island in his Egg Giant-Makan. Sonic and his friends follow him through the crater to the underground world, where they encounter giant monsters. The episode's Japanese title is very similar to the Japanese title of the 1965 sci-fi kaiju film Frankenstein Conquers the World and there are several homages to the movie throughout the episode itself.
49	23	"The Day the World Stood Still" ("The Beginning of the End") Transliteration: "Sekai ga seishi suru hi" (Japanese: 世界が静止する日)	Mamoru Enomoto	Masahiko Shiraishi	Kiyoshi Egami	March 7, 2004 (2004-03-07)	March 12, 2005
According to the government, when Sonic and his friends are in the human world, a phenomenon called "Time Stagnation" begins to occur, and "time" becomes abnormal, causing the world to go crazy. The governors then propose to return Sonic to his own world, but Chris is reluctant. The episode's Japanese title is similar to the title of the 1951 sci-fi film The Day the Earth Stood Still.
50	24	"The Morning of Farewells" ("Running out of Time") Transliteration: "Wakare no asa" (Japanese: 別れの朝)	Masami Furukawa	Chinatsu Hōjō	Toshiki Hirano	March 14, 2004 (2004-03-14)	March 19, 2005
In order to return Sonic and his friends to their own world, Tails and Chuck rush to develop the device. At that time, GUN troopers suddenly begin attacking Dr. Eggman's base. This is not the President's intent.
51	25	"Chris' Long Journey" ("Friends 'till the End") Transliteration: "Kurisu no nagai tabi" (Japanese: クリスの長い旅)	Shigeharu Takahashi	Kiyoko Yoshimura	Masanori Mizuhara	March 21, 2004 (2004-03-21)	March 19, 2005
Just as Sonic is about to return to his world, Chris runs away with him. The two of them begin their escape.
52	26	"Memories of the Wind" ("A New Start") Transliteration: "Kaze no omoide" (Japanese: 風の思い出)	Hajime Kamegaki	Yoshio Urasawa	Hajime Kamegaki	March 28, 2004 (2004-03-28)	March 26, 2005
Sonic returns to his original world. Chris looks up at the moon as he reflects on his memories of him. The original TV broadcast uses insert songs "Natsu no Hi" and "Midori no Hibi" by OFF COURSE, while home video releases use "Hikaru Michi" and "Event: The Last Scene" from Sonic Adventure 2. This was intended to be the series finale before it was renewed for a third and final season.

Season 3: The Metarex Saga (2005)

No. overall	No. in season	Title	Directed by	Written by	Storyboarded by	Japanese air date	International air date(s)
53	1	"A Messenger From A Meteor Shower" ("A Cosmic Call") Transliteration: "Ryūseiu no shisha" (Japanese: 流星雨の使者)	Mitsutaka Noshitani	Kiyoko Yoshimura	Toshiki Hirano	March 25, 2020 (2020-03-25)	March 12, 2005 (France) September 10, 2005 (US)
A new powerful enemy called a "Metarex" has appeared on Sonic's planet. Sonic struggles against them and its leader, Dark Oak, and the seven Chaos Emeralds are scattered, and the Planet Egg, the source of life on the planet, is stolen. At that time, 18-year-old Chris comes to the Planet Egg, warping in a portal he has built himself. But for some reason, he is now 12 years old.
54	2	"The Spaceship: Blue Typhoon" ("Cosmic Crisis") Transliteration: "Uchūsen Burū Taifūn-gō" (Japanese: 宇宙船ブルータイフーン号)	Hideki Hiroshima	Kiyoko Yoshimura	Masanori Mizuhara	March 26, 2020 (2020-03-26)	March 12, 2005 (France) September 17, 2005 (US)
It seems that Cosmo has come to this planet in search of Sonic in order to recover the Planet Eggs of various planets from the Metarex. Hearing this, Sonic and his friends decide to leave for space. However, while the spaceship is under construction, a Metarex soldier attacks again. There, Sonic and his partners use the main cannon "Sonic Driver," which uses Sonic as a cannonball, to intercept Metarex Spike.
55	3	"The Water Planet, Hydo" ("H2 Whoa") Transliteration: "Mizu no wakusei Haidō" (Japanese: 水の惑星ハイドー)	Masami Furukawa	Hiro Masaki	Seiji Okuda	March 27, 2020 (2020-03-27)	March 13, 2005 (France) September 24, 2005 (US)
The Blue Typhoon, the spaceship on which Sonic and his friends boarded, arrives at Hydo, a planet that has become a water planet after being robbed of its Planet Egg. Chris and Sonic board the landing craft, but Sonic is kidnapped by the Metarex. Chris attempts to save Sonic somehow.
56	4	"Dr. Eggman Joins the War!" ("An Enemy In Need") Transliteration: "Dokutā Egguman sansen!" (Japanese: Dr.エッグマン参戦！)	Takuo Suzuki	Hiro Masaki	Masanori Mizuhara	March 31, 2020 (2020-03-31)	March 14, 2005 (France) October 1, 2005 (US)
While the people of Planet Hydo are thankful after the defeat of the Metarex, Eggman tries to trick Knuckles into getting the Chaos Emerald. Just then, a frog-shaped Metarex appears and swallows the Chaos Emerald!
57	5	"The Battle at the Ice Palace!" ("A Chilling Discovery") Transliteration: "Aisu paresu no tatakai!" (Japanese: アイスパレスの戦い！)	Kazunori Tanahashi	Masahiko Shiraishi	Seiji Okuda	April 1, 2020 (2020-04-01)	March 15, 2005 (France) October 8, 2005 (US)
After arriving at Breezer, a blizzard planet, Sonic and his friends search for the Chaos Emeralds and arrive at the "Ice Palace" where the Metarex soldiers are located. They are apparently doing some kind of research there.
58	6	"The Girls' Jungle Trap" ("Desperately Seeking Sonic") Transliteration: "Otome no janguru torappu" (Japanese: 乙女のジャングルトラップ)	Nana Harada	Kiyoko Yoshimura	Seiji Okuda	April 2, 2020 (2020-04-02)	March 16, 2005 (France) October 15, 2005 (US)
Sonic and his friends arrive at a certain jungle planet and defeat the Metarex's attack with Sonic Driver, but Sonic is sent somewhere with the force of the attack. Amy, Cream, and Cosmo are looking for Sonic, but then Metarex King Ape appears.
59	7	"The Chaotix Go To Outer Space" ("Galactic Gumshoes") Transliteration: "Kaotikusu, uchū e iku" (Japanese: カオティクス、宇宙へ行く)	Hideki Hiroshima	Yoshio Urasawa	Masanori Mizuhara	April 3, 2020 (2020-04-03)	March 17, 2005 (France) October 22, 2005 (US)
The Chaotix Detectives receive a request from Cream's mother. Various items have been sent from Chris' world via the portal from episode 53, and she wants them to be delivered to the Blue Typhoon. The Chaotix arrive by spaceship, but instead of being greeted by Chris and his friends, they are attacked!
60	8	"Shadow's Rebirth" ("Trick Sand") Transliteration: "Shadō ribāsu" (Japanese: シャドウ・リバース)	Masami Furukawa	Masahiko Shiraishi	Seiji Okuda	April 6, 2020 (2020-04-06)	March 18, 2005 (France) October 29, 2005 (US)
The Blue Typhoon arrives at Hobidon, already a dead planet. There they find the wreckage and ruins of a colony, and Sonic and his friends go to the ruins in search of the Chaos Emeralds. But the ruins are the transformable Metarex Deserd itself. Sonic is in desperate straits. Then, to his surprise, Shadow appears.
61	9	"The Metarex Battleship Attacks!" ("Ship of Doom") Transliteration: "Metarekkusu senkan shūrai!" (Japanese: メタレックス戦艦襲来！)	Takuo Suzuki	Hiro Masaki	Masanori Mizuhara	April 7, 2020 (2020-04-07)	March 19, 2005 (France) November 5, 2005 (US)
Metarex Hellship, which once attacked Cosmo's immigrant ship, attacks the Crimson Egg. Its next target is the Blue Typhoon, on which Sonic and his friends ride. Sonic and his friends are forced to fight against this threat that has put even Shadow in a tight spot.
62	10	"The Secret of the Underground Canyon" ("An Underground Odyssey") Transliteration: "Chika keikoku no himitsu" (Japanese: 地下渓谷の秘密)	Mitsutaka Noshitani	Kiyoko Yoshimura	Toshihiko Masuda	April 8, 2020 (2020-04-08)	March 20, 2005 (France) November 12, 2005 (US)
Tails and Cosmo, who had been separated from Sonic and his friends on the planet Alabasta, find a facility in a cave. There, copies of the Chaos Emeralds are being made by Metarex. Tails and Cosmo attempt to escape from the pursuit of Metarex Viper.
63	11	"The Space Fortress, Metal Plant" ("Station Break-In") Transliteration: "Uchū yōsai Metaru Puranto" (Japanese: 宇宙要塞メタルプラント)	Nana Harada	Hiro Masaki	Toshiki Hirano	April 9, 2020 (2020-04-09)	March 21, 2005 (France) November 19, 2005 (US)
The two remaining Chaos Emeralds (Blue and Green) are inside the Metarex's fortress. When Sonic and Eggman learn of this, they team up with each other and attempt to break into the fortress. Then, they discover the two Chaos Emeralds and a Planet Egg.
64	12	"Clash! Sonic vs. Shadow" ("A Metarex Melée") Transliteration: "Gekitotsu! Sonikku vs Shadō" (Japanese: 激突！ソニックｖｓシャドウ)	Hideki Hiroshima	Kiyoko Yoshimura	Seiji Okuda	April 10, 2020 (2020-04-10)	March 23, 2005 (France) November 26, 2005 (US)
Waiting for Sonic and his friends are soldiers of a Metarex army led by Dark Oak. Sonic and his friends are surrounded by the Metarex army around the fortress. It was all a trap. Sonic tries to escape, but he is confronted by Shadow over the Chaos Emeralds.
65	13	"The Chaotix's Electric Shock Love Plan" ("Mission: Match Up") Transliteration: "Kaotikusu dengeki raburabu daisakusen" (Japanese: カオティクス電撃ラブラブ大作戦)	Masami Furukawa	Masahiko Shiraishi	Masanori Mizuhara	April 13, 2020 (2020-04-13)	April 5, 2005 (France) December 3, 2005 (US)
Rare visitors appear on the Blue Typhoon. They are the three members of the Chaotix Detectives. When Vector sees Tails and Cosmo chatting amiably, he is convinced that Tails is in love with Cosmo. In order to encourage Tails, who according to Vector is a late bloomer, Vector devises an unusual plan.
66	14	"Cross the Galactic Corridor!" ("Clash in the Cloister") Transliteration: "Ginga kairō o watare!" (Japanese: 銀河回廊をわたれ！)	Kazuo Nogami	Hiro Masaki	Seiji Okuda	April 14, 2020 (2020-04-14)	April 6, 2005 (France) February 4, 2006 (US)
At last, the Blue Typhoon enters the galactic corridor. The interior of the corridor is a mysterious tunnel-like space, and it is blocked by cosmic dust that has blown in like the roots of a plant, preventing progress. The Blue Typhoon, stuck in the corridor, is attacked by Yellow Zelkova, the most powerful of the four Metarex bosses.
67	15	"The Black Trap" ("Teasing Time"/"Testing Time") Transliteration: "Burakku torappu" (Japanese: ブラック・トラップ)	Hajime Kamegaki	Yoshio Urasawa	Hajime Kamegaki	April 15, 2020 (2020-04-15)	April 7, 2005 (France) February 11, 2006 (US)
There is a massive Chaos Emerald signature from an asteroid. The Blue Typhoon heads there and found an old factory. Inside is a Chaos Emerald production plant. Then Black Narcissus, one of the four Metarex bosses, appears.
68	16	"Above a Destroyed Planet" ("A Revolutionary Tale") Transliteration: "Kowareta hoshi no ue de" (Japanese: こわれた星の上で)	Mitsutaka Noshitani	Kiyoko Yoshimura	Toshiki Hirano	April 16, 2020 (2020-04-16)	April 8, 2005 (France) February 18, 2006 (US)
Molly, a young girl from the planet "Cascade," is fighting the Metarex to restore the planet. She becomes interested in Shadow, who is as strong as the legendary hero "Black Wind" himself. Shadow, Rouge, and Molly then decide to follow the signature of a Chaos Emerald to the mining site of Cascade. This is the second and final episode where Sonic and his friends aren't present, the first being "The Adventures of Knuckles and Hawk", and the only episode of Season 3 without Cosmo.
69	17	"Please, Marmolim!" ("The Planet of Misfortune") Transliteration: "Onegai Marumorin!" (Japanese: お願いマルモリン！)	Hideki Hiroshima	Kiyoko Yoshimura	Seiji Okuda	April 17, 2020 (2020-04-17)	April 9, 2005 (France) February 25, 2006 (US)
The Blue Typhoon, with Chris aboard, encounters the three Marmolims, Momo, Lue, and Lylem, who have a Chaos Emerald. Sonic and his team are then forced to return their ship to their home planet in exchange for the Chaos Emerald.
70	18	"The Eggman Fleet Appears!" ("Terror on the Typhoon") Transliteration: "Egguman kantai arawaru!" (Japanese: エッグマン艦隊現る！)	Masami Furukawa	Masahiko Shiraishi	Masanori Mizuhara	April 20, 2020 (2020-04-20)	April 10, 2005 (France) March 4, 2006 (US)
Sonic rescues a mysterious spaceship being chased by the Metarex, but the pilot of the spaceship is Decoe. At that moment, the Metarex's fleet warps out. To everyone's surprise, the Metarex and Eggman have teamed up.
71	19	"Café Chaotix" ("Hedgehog Hunt") Transliteration: "Kafe Kaotikusu" (Japanese: カフェ・カオティクス)	Takuo Suzuki	Hiro Masaki	Seiji Okuda	April 21, 2020 (2020-04-21)	April 11, 2005 (France) March 11, 2006 (US)
The Chaotix Detectives run a café on a planet in the Metarex space. Today, a new customer visits the café. This time, however, it is Eggman, who has just been appointed as part of the four Metarex bosses.
72	20	"The True Form of the Metarex?!" ("Zelkova Strikes Back") Transliteration: "Metarekkusu no shōtai!?" (Japanese: メタレックスの正体！？)	Mitsutaka Noshitani	Kiyoko Yoshimura	Seiji Okuda	April 22, 2020 (2020-04-22)	April 12, 2005 (France) March 18, 2006 (US)
Chased by the Metarex, the Blue Typhoon crash-lands on the planet Thunderbolt after a surprise attack by Yellow Zelkova. Yellow Zelkova is impervious to all attacks. In the fierce battle, Chris and Sonic are sent flying far away.
73	21	"Shadow, the Assassin!" ("The Cosmo Conspiracy") Transliteration: "Ansatsusha Shadō!" (Japanese: 暗殺者シャドウ！)	Nana Harada	Masahiko Shiraishi	Nana Harada	April 23, 2020 (2020-04-23)	April 13, 2005 (France) April 1, 2006 (US)
There is an intruder on the Blue Typhoon. It is Shadow, who is after Cosmo's life. Tails desperately escapes with Cosmo, but Shadow hunts them down, which means Cosmo is in danger.
74	22	"The Lost Planet" ("Eye Spy") Transliteration: "Rosuto puranetto" (Japanese: ロスト・プラネット)	Hideki Hiroshima	Kiyoko Yoshimura	Masanori Mizuhara	April 24, 2020 (2020-04-24)	April 14, 2005 (France) April 8, 2006 (US)
Sonic and his friends learn that Cosmo has been used by Dark Oak as a "living spy tool" that transmits what she sees and hears. Sonic and his friends are shocked, but when Cosmo tries to leave, they hold her back and vow to fight with her.
75	23	"The Day of the Forestations" ("Agent of Mischief") Transliteration: "Shinka no hi" (Japanese: 森化の日)	Masami Furukawa	Masahiko Shiraishi	Seiji Okuda	April 27, 2020 (2020-04-27)	April 15, 2005 (France) April 15, 2006 (US)
The Blue Typhoon takes off from the planet Green Gate and heads for coordinates 000 000. There is the planet Aquarius, which requires Chaos Emeralds and a giant Planet Egg. The final battle with the Metarex armada is about to begin.
76	24	"Decisive Battle! Dark Oak" ("The Light in the Darkness") Transliteration: "Kessen! Dāku Ōku" (Japanese: 決戦！ダーク・オーク)	Yutaka Saitō	Kiyoko Yoshimura	Seiji Okuda	April 28, 2020 (2020-04-28)	April 16, 2005 (France) April 22, 2006 (US)
Chris and his team bet on the Master Emerald for a comeback. They are going to use the Sonic Driver mechanism to strike the Master Emerald's energy into the Chaos Emeralds. Shadow and the Chaotix join in on the task, pushing back the Final Mova's attack with all their might. In the midst of the battle, Eggman tells Chris a shocking revelation.
77	25	"What I Can Do For You" ("A Fearless Friend") Transliteration: "Kimi no tame ni dekiru koto" (Japanese: 君のためにできること)	Mitsutaka Noshitani	Kiyoko Yoshimura	Masanori Mizuhara	April 29, 2020 (2020-04-29)	April 17, 2005 (France) April 29, 2006 (US)
The Final Mova becomes a giant nut. As if in answer to Cosmo's prayer, the Chaos Emeralds once again revive their power, and the golden Super Sonic and Super Shadow stand side by side. The onslaught of the two brake through the nut's outer contour, finally causing it to explode into pieces, but it is not the end.
78	26	"Where Planets Are Born" ("So Long Sonic") Transliteration: "Hoshi no umareru tokoro" (Japanese: 星の生まれるところ)	Hajime Kamegaki	Kiyoko Yoshimura	Hajime Kamegaki	April 30, 2020 (2020-04-30)	April 18, 2005 (France) May 6, 2006 (US)
The battle is over. Chris, who has given up on returning to Earth because there is no hope of restoring the Master Emerald, receives an envelope from Eggman. Inside is a ticket labeled "one-way ticket to Earth." This is the series finale.

Theme songs

Japan

• Opening

1. "Sonic Drive"
   • April 6, 2003 – March 28, 2004 and March 25, 2020 – April 30, 2020
   • Lyricist: Takeshi Aida
   • Composer / Arranger: Cher Watanabe
   • Singers: Hironobu Kageyama and Hideaki Takatori
   • Episode Range: 1–78

• Endings

1. "Fu-tu-re" (ミ・ラ・イ, Mi-ra-i)
   • April 6, 2003 – June 29, 2003
   • Lyricist / Composer / Arranger: Kazuyoshi Baba
   • Singers: Run&Gun
   • Episode Range: 1–13
2. "Shining Road" (光る道, Hikaru michi)
   • July 6, 2003 – December 28, 2003 and March 25, 2020 – April 30, 2020
   • Lyricist: Shun Taguchi
   • Composer / Arranger: Masataka Matsutoya
   • Singer: Aya Hiroshige
   • Episode Range: 14–39 and 53–78
3. " T.O.P."
   • January 4, 2004 – March 28, 2004
   • Lyricists / Singers: KP
   • Composer / Arranger: URU
   • Episode Range: 40–52

United States

Opening

1. "Gotta Go Fast"
   • August 23, 2003 – May 6, 2006
   • By Norman Grossfeld and Russell Velazquez
   • Episode Range: 1–78

Ending

1. "Gotta Go Fast" (shortened version)
   • August 23, 2003 – May 6, 2006
   • By Norman Grossfeld and Russell Velazquez

PAL regions

Opening

1. • "Sonic X"

• August 23, 2003 – May 6, 2006
• By Marc Biagi and Nikki Gregoroff
• Episode Range: 1–78

Ending

• PAL region broadcasts use the same melody of the American ending theme, with the pitch sometimes adjusted.

South Korea

South Korea has the same melody of the Japanese opening theme and the first ending theme, with the lyrics translated into Korean.

Italy

"Sonic" (Episodes 1–78)

France

The French dubbing has the same melody of the Japanese opening theme, but it is adapted into French lyrics instead. Endings are instrumental.

Home video releases

Japan

A total of 13 DVD and VHS volume compilations was released by Victor Entertainment and Universal Music. "Hi-Spec" editions of volumes 1–10 have also been released, which include bonus features and 5.1 audio.

VHS/DVD Name	Episodes	Release Date
ソニックX Vol.1	1–5	July 23, 2003
ソニックX Vol.2	6–9	August 21, 2003
ソニックX Vol.3	10–13	September 26, 2003
ソニックX Vol.4	14–17	October 22, 2003
ソニックX Vol.5	18–21	November 21, 2003
ソニックX Vol.6	22–25	December 17, 2003
ソニックX Vol.7	26–29	January 21, 2004
ソニックX Vol.8	30–33	February 21, 2004
ソニックX Vol.9	34–36	March 24, 2004
ソニックX Vol.10	37–39	April 21, 2004
ソニックX Vol.11	40–43	May 21, 2004
ソニックX Vol.12	44–47	June 23, 2004
ソニックX Vol.13	48–52	July 21, 2004

United States

DVD

Funimation released episodes 1–52 in 10 single-disc releases:

DVD Name	Episodes	Release Date
Sonic X: Vol. 1: A Super Sonic Hero	1. "Chaos Control Freaks" 2. "Sonic to the Rescue" 3. "Missile Wrist Rampage" 27. "Pure Chaos"	June 1, 2004
Sonic X: Vol. 2: The Chaos Factor	4. "Chaos Emerald Chaos" 5. "Cracking Knuckles" 6. "Techno-Teacher" 7. "Party Hardly"	June 1, 2004
Sonic X: Vol. 3: Satellite Swindle	8. "Satellite Swindle" 9. "The Last Resort" 10. "Unfair Ball" 11. "Fly Spy"	October 12, 2004
Sonic X: Vol. 4: Beating Eggman	12. "Beating Eggman (Part 1)" 13. "Beating Eggman (Part 2)" 14. "That's What Friends are For" 15. "Skirmish in the Sky" 16. "Depths of Danger"	December 7, 2004
Sonic X: Vol. 5: Sonic's Scream Test	17. "The Adventures of Knuckles and Hawk" 18. "The Dam Scam" 19. "Sonic's Scream Test" 20. "Cruise Blues" 21. "Fast Friends"	January 25, 2005
Sonic X: Vol. 6: Countdown to Chaos	22. "Little Chaos Lost" 23. "Emerald Anniversary" 24. "How to Catch a Hedgehog" 25. "A Dastardly Deed" 26. "Countdown to Chaos"	April 12, 2005
Sonic X: Vol. 7: Revenge of the Robot	28. "A Chaotic Day" 29. "A Robot Rebels" 30. "Heads Up, Tails!" 31. "Revenge of the Robot" 32. "Flood Fight"	June 14, 2005
Sonic X: Vol. 8: Project Shadow	33. "Project: Shadow" 34. "Shadow Knows" 35. "Sonic's Big Break" 36. "Shadow World" 37. "Robotnik's Revenge" 38. "Showdown in Space"	November 15, 2005
Sonic X: Vol. 9: Into the Darkness	39. "Defective Detectives" 40. "Sunblock Solution" 41. "Eggman for President" 42. "A Date to Forget" 43. "Mean Machines" 44. "Sewer Search"	February 7, 2006
Sonic X: Vol. 10: The Beginning of the End	45. "Prize Fight" 46. "A Wild Win" 47. "Map of Mayhem" 48. "The Volcanic Venture" 49. "The Beginning of the End" 50. "Running out of Time" 51. "Friends 'Till the End" 52. "A New Start"	May 16, 2006

The episodes were re-released in "Saga" sets:

DVD Name	Episodes	Release Date
Sonic X: New World Saga	1. "Chaos Control Freaks" 2. "Sonic to the Rescue" 3. "Missile Wrist Rampage" 4. "Chaos Emerald Chaos" 5. "Cracking Knuckles" 6. "Techno-Teacher" 7. "Party Hardly" 8. "Satellite Swindle" 9. "The Last Resort" 10. "Unfair Ball" 11. "Fly Spy" 12. "Beating Eggman (Part 1)" 13. "Beating Eggman (Part 2)"	November 13, 2007
Sonic X: Chaos Emerald Chaos	14. "That's What Friends are For" 15. "Skirmish in the Sky" 16. "Depths of Danger" 17. "The Adventures of Knuckles and Hawk" 18. "The Dam Scam" 19. "Sonic's Scream Test" 20. "Cruise Blues" 21. "Fast Friends" 22. "Little Chaos Lost" 23. "Emerald Anniversary" 24. "How to Catch a Hedgehog" 25. "A Dastardly Deed" 26. "Countdown to Chaos"	May 20, 2008
Sonic X: Chaos & Shadow Sagas	27. "Pure Chaos" 28. "A Chaotic Day" 29. "A Robot Rebels" 30. "Heads Up, Tails!" 31. "Revenge of the Robot" 32. "Flood Fight" 33. "Project: Shadow" 34. "Shadow Knows" 35. "Sonic's Big Break" 36. "Shadow World" 37. "Robotnik's Revenge" 38. "Showdown in Space"	September 9, 2008 September 23, 2008
Sonic X: The Egg Moon, Emerl & Homebound Sagas	39. "Defective Detectives" 40. "Sunblock Solution" 41. "Eggman for President" 42. "A Date to Forget" 43. "Mean Machines" 44. "Sewer Search" 45. "Prize Fight" 46. "A Wild Win" 47. "Map of Mayhem" 48. "The Volcanic Venture" 49. "The Beginning of the End" 50. "Running out of Time" 51. "Friends 'Till the End" 52. "A New Start"	September 22, 2009

Episodes 53–78 made their way to the U.S. in two 13-episode box sets:

DVD Name	Episodes	Release Date
Sonic X: The Complete 5th Season	53. "A Cosmic Call" 54. "Cosmic Crisis" 55. "H2 Whoa" 56. "An Enemy in Need" 57. "A Chilling Discovery" 58. "Desperately Seeking Sonic" 59. "Galactic Gumshoes" 60. "Trick Sand" 61. "Ship of Doom" 62. "An Underground Odyssey" 63. "Station Break-In" 64. "A Metarex Melee" 65. "Mission: Match-Up"	September 12, 2006 October 31, 2006
Sonic X: So Long, Sonic	66. "Clash in the Cloister" 67. "Teasing Time/Testing Time" 68. "A Revolutionary Tale" 69. "The Planet of Misfortune" 70. "Terror on the Typhoon" 71. "Hedgehog Hunt" 72. "Zelkova Strikes Back" 73. "The Cosmo Conspiracy" 74. "Eye Spy" 75. "Agent of Mischief" 76. "The Light in the Darkness" 77. "A Fearless Friend" 78. "So Long Sonic"	February 13, 2007

DVD Name	Episodes	Release Date
Sonic X: Collection 1	1–52	November 4, 2016
Sonic X: Collection 2	53–78	December 6, 2016

Blu-ray

Blu-ray Name	Episodes	Release Date
Sonic X: The Complete Series English Dub	1–78	May 28, 2019
Sonic X: The Complete Series Japanese Sub	1–78	April 25, 2023

United Kingdom

UK DVD

Warner Home Video and Jetix Consumer Products released only 4 volumes with episodes from 1 to 8.

• Volume 1 – Episode 1–2 ("Chaos Control Freaks" and "Sonic to the Rescue")
• Volume 2 – Episode 3–4 ("Missile Wrist Rampage" and "Chaos Emerald Chaos")
• Volume 3 – Episode 5–6 ("Cracking Knuckles" and "Techno-Teacher")
• Volume 4 – Episode 7–8 ("Party Hardly" and "Satellite Swindle")

Australia

In Australia, 17 volumes of the first series were released by MRA Entertainment in 2005–2006, which featured three episodes per disc.