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Again, "The episode is one of those which helped to explore the series' overarching mythology." I feel this is kind of a clunky why to write this, maybe say "The episode helps to explore and expand the series' overarching mythology."
Infobox, maybe cite where you found all the guests stars at the very bottom, maybe after "Tegan Moss as Young Dana Scully" Is there a way to put a cite after the words "Guest stars"?
"and it was felt that this two-part story was a good place to expand upon this as it allowed the production crew to "stretch the limits" of their resources and imagination." rewrite into "and it was felt that this two-part story was a good place to expand upon this, allowing the production crew to "stretch the limits" of their resources and imagination."