Superman: The Animated Series episode 30 - World's Finest (Part II)
The Joker kidnaps Lois Lane and uses her as bait in an attempt to kill Superman. He has her bound and gagged in his lair and sends a video message to Superman telling his location. First Superman wears a lead suit, but Joker uses acid from his flower to melt through the suit. Batman manage to stop him and save the two, causing Lex Luthor to become irritated and give him one last chance to defeat the two heroes.