After catching The Joker in a skydiving battle, Batman
will get in
his Batplane and blow up The Joker's blimp with his missiles. Then
will take The Joker to where he belongs... Arkham Asylum.
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Then you will see all the villains in prison cells inside the Asylum
(Mr. Freeze, Poison Ivy, Harley Quinn and The Joker). The Camera will
go to the Joker, and you will see that he created a Batman dummy,
hanging from the prison ceiling. Do you think he doesn't like Batman?
Anyway, the commissioner will turn on the giant bat light signal and
project it into the sky, and Batman appears before the commissioner.
They will talk. The commissioner will explain that the batarang that
hit him (just after the Gasworks level) had Harley Quinn's fingerprints
on it. Then he will say that he is glad that the Joker isn't dead(???) and
is glad he is in jail. The commissioner will turn to face Batman, but he's gone...
The next scene is cinematic (better graphics), where Batman
a pillar, awaiting his next mission. The end.
(By the way, don't try to watch the credits all the way to the end. It just
repeats itself forever. Just press A).