Forearm

Michael McCain is a mutant born with two extra arms granting him superhuman strength, stamina, and durability. Operating under the name Forearm, he became an early operative of the militant Mutant Liberation Front, first surfacing when the MLF clashed with the New Mutants.

Forearm crashed onto the scene in the pages of The New Mutants #87 in 1990 — one of the most consequential single issues of the Copper Age, a debut that also introduced Cable and helped launch the era-defining X-Force franchise. Created by Louise Simonson and Rob Liefeld, this Marvel mutant has been a persistent presence in the X-corner of the universe for over three decades, turning up across X-Force, X-Factor, and beyond, sharing panels with heavy hitters like Cannonball, Cable, and Nathan Summers. With 35 catalog appearances and two key-issue credits to their name, Forearm is the kind of deep-cut character that rewards collectors who dig past the headliners — a fixture of the gritty, high-octane mutant storytelling that defined Marvel's early '90s reinvention.