Batman: White Knight stopped with a fist, i.e. Batman's methods. This led him to turn the Joker into a politician, using the character's intelligence and charisma to win the people of Gotham over. DC Comics had no problems with the ideas that Murphy had for the series such as changing the timeline in Batman's history. However, the adult content like nudity and profanity that Murphy had intended to include were not permitted. Murphy revealed that the Joker in "White Knight" has the real name Jack Napier, a callback to Tim Burton's 1989 "Batman" film where the Joker played by Jack Nicholson also shares
Batman Beyond: Return of the Joker was taken from Katsuhiro Otomo's sci-fi film "Akira". The Jolly Jack Candy Factory, the resurrected Joker's hideout, is a reference to American comic book artist Jack Kirby, who, during his early Marvel Comics days, was known as "Jolly" Jack Kirby. Many scenes written in the film's original script, like one featuring The Penguin being interrogated by Batman at the Iceberg Lounge during the flashback sequence in order to discover the whereabouts of The Joker and Robin or one showing the Jokerz being arrested by Barbara Gordon and the Gotham City Police Department, were deleted due to time constraints. Woof even