Psimon later allied himself with the immortal dimensional traveler known as the Monitor during the seminal 1985 event known as Crisis on Infinite Earths. During this, the rest of the Five, feeling betrayed by Psimon, turned on him, apparently killing him. In Pre-Crisis continuity, Brainiac and the Earth-1 Lex Luthor saved Psimon from the Anti-Monitor's Shadow Demons and recruited him for their villain army, taking over Earths 4, S, and X. He became suspicious of the two villains' plans and, learning that they were going to take over the worlds by themselves once the heroes and villains were wiped out, attacked the two. He apparently destroyed Brainiac and went to finish off Luthor, only to have his brain blasted away by a recreated Brainiac in one of the more brutal surprise deaths of the storyline.
