"The Joker, Part 1 of 2: Tears of a Clown"
The Joker has captured current and former members of the Gotham University's Comedy Club because they all laughed at him during his stage debut and he wants revenge. He is hunted down both by Batman, and by Wild, whose entire family had been killed by the Joker. Wild gets a face full of laughing gas, and the Joker escapes, but Batman is able to save most of the Joker's captives.