The X-Men #6
In "Sub-Mariner! Joins the Evil Mutants," Stan Lee and Jack Kirby deliver a pivotal moment in early X-Men history, as Professor Xavier and Magneto both speculate on Namor’s possible mutant status—leading to a dramatic invasion of Atlantis. With Chic Stone’s dynamic inks and Stan Goldberg’s vivid colors, the issue captures the clash of ideologies and the Sub-Mariner’s fateful choice, all rendered in Kirby’s bold, iconic style.
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Xavier reads a news story about Namor and wonders if he is a possible mutant. Magneto comes to the same conclusion and invades the Sub-Mariner's realm with an invitation to join his Brotherhood. Enchanted by the Scarlet Witch, Namor agrees. The X-Men attack and, during the ensuing battle, Namor decides not to join either team, mutant or no.
Plot details indexed by the Grand Comics Database (CC BY-SA).