Cain Marko

Stepson of Professor Charles Xavier's father, Cain Marko discovered the mystical Crimson Gem of Cyttorak while serving in the U.S. Army, which transformed him into the avatar of the godlike entity Cyttorak — an unstoppable, supernaturally powerful juggernaut. His resentment of his stepbrother Charles made him a recurring nemesis of the X-Men.

Few Marvel villains have stomped through the pages of comics with the sheer, unstoppable presence of Cain Marko, who first crashed onto the scene in The X-Men #12 back in 1965 — a Silver Age debut courtesy of the legendary trio of Stan Lee, Jack Kirby, and Alex Toth. Over an astonishing six decades of publication, Marko has racked up 435 catalog appearances and 18 key issues, a testament to just how indelible a figure he's become in the Marvel Universe. His adventures unfold most often across the pages of X-Men, The Uncanny X-Men, and The Amazing Spider-Man, where he shares the stage with titans like Wolverine, Cyclops, and Spider-Man. Whether you're a longtime collector or just discovering what makes Marvel's Silver Age so thrilling, Cain Marko is exactly the kind of character whose long, turbulent history rewards every issue you track down.