Mimic Calvin Montgomery Rankin

X-Men, vol. 1 #27 (1966)

Blackmailed his way to the X-Men's house. He stole their powers, used them against the team, and kidnapped Jean. When he tried to enhance his powers with his dead father's machine, he lost them. Professor X then erased his memory. Former member of Norman Osborn's X-Men. Rejoined to help his friend Weapon Omega.

Last seen in X-Men: Legacy.

Powers: Copies other mutants' powers and abilities, sometimes permanently. Retains the original five X-Men's powers indefinitely.