This one's basically two hours of the Joker and Harley talking and/or singing. Very, very little else happens. At the climax, during the Joker's trial (which is headed up by Harvey Dent), the Joker admits to the jury that he's not crazy, that he's just a bitter little nobody, which causes Harley and all the Joker's fanboys to angrily storm out of the courtroom and blow up courthouse. The explosion turns Harvey Dent into Two-Face, then the Joker gets stabbed to death in Arkham by one of his former fans who feels betrayed by his admission. The Joker's killer then starts laughing and carves a smile into his own face, which I guess implies that he's now the Joker or something. I dunno, I was way beyond caring at that point. I wanted to see The Wild Robot.