X-Men, First Series, Number 31, April, 1967, cover.

©Marvel Comics
"We Must Destroy the Cobalt Man"

Editor: Stan Lee
Penciller: Jack Kirby
Inks: Dan Adkins
Letterer: ?
Colorist: ?

Script: Roy Thomas
Penciller: Werner Roth
Inks: John Tartaglione
Letterer: ?
Colorist: ?

X-Men 31 features the first appearance of Ralph Roberts, the Cobalt Man, who would become a continuing villain in the Marvel Universe. It also introduces supporting character Candy Sothern, Factor Three and has a guest appearance by Iron Man.

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