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What is… The Mutant Factor?

Spider-Man #15 (Oct 1991) comic book cover featuring the Beast
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Spider-Man #15 (Oct 1991) – What Is… The Mutant Factor?! Marvel Comics – CGC Graded

Own a piece of Marvel history with this original 1991 issue of Spider-Man #15! Featuring the thrilling debut of Beast from the X-Men in the story arc ‘What is… The…

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