FTP, identify this man born Cain Marko, the half-brother of Charles Xavier, and an enemy of the X-Men named for being an unstoppable force.
His transformation occurred when he deserted while under fire in Korea.  Initially he was believed to buried alive in the temple of Cyttorak, a deity whose ruby granted this figure his powers.  However, he resurfaced with his constant crony Black Tom, and it is discovered that his only weak spot is his mind, which is protected by a psionic helmet.  FTP, identify this man born Cain Marko, the half-brother of Charles Xavier, and an enemy of the X-Men named for being an unstoppable force.
His transformation occurred when he deserted while under fire in Korea.  
Juggernaut (accept early: Cain Marko)