Go on, spoil yourself with the ending.
Batman defeats Clayface. The Joker attempts to drink the cure, but Batman stops him. Batman picks up the cure. Joker stabs him in the back. The cure smashes of the floor. Joker dies without the cure. Batman carries Joker outside. End credits role. During end credits Harley Quinn sings to her baby. (As seen in a Easter egg.) I didn't hear it, but it exists. Catwoman faces Two-Face, and she meets up with Batman. END GAME.
OK, so what I think is that when Joker fell when attacked by Batman, Clayface quickly grabbed him and transformed into his body. The Joker is out of view, hiding. Batman takes Clayface outside to the police, without knowing Joker is alive. Batman is the leader of the League of Assassins, as he killed Ra's Al Ghul when falling from Wonder Tower, but Batman dose not know. Some one knows about the Lazarus Pit and finds Talia Al Ghul. He/She rescues Talia. Talia vows revenge on Batman for leaving her and sets out to become the ultimate assassin.
(I probably have a LOT of this inaccurate, fan fiction if you will, so sorry.

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