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Uncanny X-Men #221 features the first appearance of Mr. Sinister, a significant antagonist in the X-Men series. The storyline delves into the machinations of this new villain as he targets the mutants, adding a layer of mystery and danger. The cover, illustrated with dynamic action, captures the intense energy of the comic. This issue is a key addition for collectors due to its introduction of an iconic character.
Keywords: Uncanny X-Men Marvel comics superhero 1987 collectible vintage graphic novel X-Men comic book