Doomsday

Doomsday was a bloodthirsty Kryptonian monster created by Lex Luthor from the corpse of General Zod (combined with his own blood, in a long-forbidden ancient ritual), in order to bring down both Batman and Superman.

Allies

 * Lex Luthor - creator
 * General Zod †

Enemies

 * Superman - enemy and attempted victim
 * Wonder Woman - enemy
 * Batman - enemy
 * Jon Stewart - killer
 * Flash - killer