The Joker kidnaps a famous director to show him his idea for for a tv show, starring himself. The Joker is placed in Looney Tunes-esque situation, along with various other Batman villians and even Batman himself. In the final issue, Batman arrives, saying he didn't like his character, and drags Joker back to Arkham.
The Joker- Gotham City's most annoying criminal, his prankish antics often get him in trouble with Batman and other supervillians, but he always has a trick up his sleeve.
Batman- Jokers rival and occasional ally, he's annoyed by Joker's pranks, but sometimes teams-up with Joker to take down other villians.
Harley Quinn- Joker's girlfriend, mostly serves as a damsel-in-distress.
Robin- Batman's sidekick, he always eager to help Batman fight crime, but usually ends up harming him.
Carl Grissom- Joker's "old boss", and his arch-enemy.