Superman #43 1990

Superman #43 (May 1990) features "The Evil Factory!", where a nefarious organization creates a green-skinned clone of the Man of Steel, powered by kryptonite radiation, to destroy him. This issue is notable for introducing the Kryptonite Man, a formidable new foe directly tied to Superman's greatest weakness. Additionally, Jimmy Olsen and the Guardian infiltrate the Evil Factory to rescue Jimmy's captive mother, culminating in an explosive confrontation.