The super-soldier serum turned scrawny Steve Rogers into the peak of human physical perfection, and his vibranium shield can absorb a direct hit from Thor's hammer without a scratch. Cap is the best hand-to-hand combatant in the Avengers, a master tactician who once outmaneuvered Thanos, and possesses a moral compass so unshakeable he wielded Mjolnir. He doesn't win because he's the strongest—he wins because he does not quit.

Born James Howlett but known to the world as Logan, Wolverine is the Canadian mutant who simply refuses to stay dead. His adamantium-laced skeleton is virtually indestructible, his healing factor can regenerate from a single cell, and his razor-sharp claws slice through anything short of Captain America's shield. Three centuries of combat experience make him the best there is at what he does—and what he does isn't very nice.