Brainiac takes control of Lex Luthor (nonfiction)
Brainiac takes control of Lex Luthor in a page from the Superman story "Whatever Happened to the Man of Tomorrow?"
The Silver/Bronze Age Brainiac met his end in the "Whatever Happened to the Man of Tomorrow?" storyline that closed out the Pre-Crisis Superman chronology. Lex Luthor found Brainiac's robotic head and was fused with it, making him immortal to everything. Brainiac took control of Luthor's body and sought to destroy Superman once and for all, teaming up with the Legion of Super-Villains. Fighting Brainiac's control, Luthor begged a superpowered Lana Lang to kill him; she complied by breaking his neck. Though Luthor died, Brainiac was able to retain control of the body for a little while before rigor mortis set in and his brain was forced to leave it. "Propelled by sheer malice", the skull crawled a few inches before finally running down.