The Uncanny X-Men #221

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The Uncanny X-Men #221 is a 1987 Marvel comic book issue notable for introducing the villainous genetic mastermind Mister Sinister to the X-Men mythos.

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Label	Occurrences
The Uncanny X-Men #221 canonical	1

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Mr. Sinister → firstAppearance → The Uncanny X-Men #221 ⓘ