Cain Marko, who would become the Juggernaut, was an embittered youth overshadowed by his brilliant stepbrother, Charles Xavier. After a dispute led them to enlist in the then-ongoing war, Cain discovered the mystical Cyttorak temple and a ruby promising immense power. Fueled by jealousy, Cain seized the gem and was transformed into the Juggernaut, gaining immense strength and near-invulnerability. His booming, gravelly voice, full of raw, primal menace, commands fear and attention, echoing like an avalanche and making even the bravest heroes shiver.