<Li> In the Batman Beyond episode "Joyride", the Jokerz used the Joker's remains for their initiation ritual . A deleted scene in the film would have involved Bruce Wayne checking these remains to ascertain whether or not the original Joker was really dead . Wayne finds the body suspended over the Arkham Operating Theatre with a note pinned to the chest reading "I know". </Li> <Li> Enhanced versions of the Jokerz seen in Return of the Joker later appear in the Justice League Unlimited episode "The Once and Future Thing: Part II--Time Warped", thanks to the actions of supervillain Chronos . Terry is killed by the Jokerz but Green Lantern and the original Batman manage to subdue Chronos and put things right, therefore restoring Terry and returning the Jokerz to normal . </Li> <Li> In continuity, Return of the Joker appears to be set after the Batman Beyond episode "King's Ransom", where Paxton Powers is arrested, leaving Wayne - Powers up for grabs . However, the film could take place after the entire series, because none of the plot elements are followed up, and no mention is made of the Joker or Tim Drake during the third season until the Static Shock episode "Future Shock" and the Justice League Unlimited episode "Epilogue". Producer Bruce Timm has reportedly stated that the events in the flashback take place at the end of the current DC animated universe timeline, which is after the Justice League Unlimited series finale "Destroyer", but before the Batman Beyond series premiere "Rebirth". However, Batman, Batgirl, Robin, and Harley Quinn all retain their The New Batman Adventures designs, while the Joker appears in his Static Shock and Justice League design . </Li> <Li> In the Justice League Unlimited episode "Epilogue", it is revealed that the genetics technology used by the Joker have been stolen from Project Cadmus . </Li>

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