Fan Casting Batman and Superman: World’s Finest (1991)

Set one year after the first Superman and about three months after Feats Of Clay, Batman and Superman continue to protect their respective cities, but soon the megalomaniac Supercomputer alien Brainiac, arrives and threatens to shrink both Gotham and Metropolis to add to his collection of cities from across the Galaxy. Now The two heroes must team up to take down Brainiac, and may even have to something unthinkable, partner wit their archenemies, The Joker and Lex Luthor, as well as aid from another criminal, a jewel thief known as Catwoman