(Uncanny) X-Men #6

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  • 3rd appearance of The Brotherhood of Evil Mutants: Magneto, Scarlet Witch, Quicksilver, Mastermind, Toad]
  • Namor is confirmed to be a mutant in this issue making him the first mutant to appear in Marvel Comics
Details
Publisher Marvel
Published July 1964
Written By Stan Lee
Illustrated By Jack Kirby