thumb|right|292px|Joker's appearance. WARNING: Blood and Language The Joker is Batman's number-one villain. There are 4 different Jokers in the series: Jack Nicholson Joker, Heath Ledger Joker 1, Heath Ledger Joker 2, and Heath Commrad Joker.
Jack Nicholson Joker[]
Unknown to explain but, Jack Nicholson Joker is still alive. On every episode, this Joker always has an evil plan up his sleeve.
Heath Ledger Joker 1[]
Heath Ledger Joker was unknown in his first appearance. He appeared in "Nightwing Origin". He stole lots of money and he shot his thugs, who wanted a share of the money. In the ending, he got assassinated by a missile launched by Nightwing. His body got eaten by a pack of wolves later.
Heath Ledger Joker 2[]
This Joker is lazy and less-villianous. He only appeared in "Joker Watches the Hills." He calls his wife Harley a "fattie."
Heath Commrad Joker[]
This Joker is more evil and tried to kill Robin and Mutt Williams but was foiled by Batman (who didn't want to save him but was forced to do so anyway). He has only appeared in the Lego Batman and Indiana Jones Movie 3.