The way Man of Steel handled General Zod (and particularly his death) has made him infamous, but make no mistake about it, his comic book counterpart is every big as formidable and evil. Obsessed with conquering Earth and turning it into a new Krypton, Zod has clashed with Superman many times over the years and is determined to make the hero kneel before him. While his big screen appearances have arguably portrayed Zod as a much greater threat than the comics have, this Phantom Zone escapee is someone who Superman has no other choice than to take very seriously, especially as he's vastly superior in terms of fighting ability.