Lex Luthor makes his first appearance in this book in Batman 293 (Nov. 77), the third installment of “Where Were You on the Night Batman was Killed?”, by Reed, Calnan and Blaisdel.
Lois Lane has a cameo as well, and Luthor wears the most garish outfit he ever has, as he explains to Two-Face and the court how Batman was merely a sidelight in his plot to kill Superman.
Using a satellite and a gang to lure Batman into the right location, Lex Luthor claims to have switched the minds of Superman and Batman, leaving Superman in a powerless and vulnerable body.
Then, using his amped up gloves, Luthor beats Batman to death, in order to kill Superman.
Unlike the previous two stories, we learn, from Superman, that all this did occur just as Luthor explained. At least, so far as Luthor knew. Batman had infiltrated Luthor’s gang early on, and learned the entire plan. He kept his eyes insulated from the satellite’s effects, so the heroes brains were never switched, and Batman only pretended to let Luthor kill him, with his suit also reinforced against the power gloves. Superman gives the rest of the villains present immunity (which is a darn good hint that something much bigger is really going on in this story arc), but takes Luthor away.
The storyline concludes in the next issue.