Batman Beyond Return Of The Joker -

: Years prior, the Joker kidnapped and tortured Tim Drake (the second Robin), brainwashing him into a "mini-Joker" named J.J..

: Bruce Wayne is convinced the Joker is dead, leading to a series of flashbacks that reveal a tragic final encounter between the original Batman family and the Clown Prince of Crime. Batman Beyond Return of The Joker

: The returned Joker is actually a biological copy stored within Tim Drake's subconscious via advanced nanotechnology stolen from Project Cadmus. Production & Versions Honest Opinions on Batman Beyond: Return of the Joker? : Years prior, the Joker kidnapped and tortured