©Marvel Comics
"We Must Destroy the Cobalt Man"

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

Story
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.