Superman vs. Batman
Superman (Routh) from Superman Returns versus Batman (Bale) from The Dark Knight.
The Joker has escaped from Arkham Asylum and decides to have some fun away from home by going to Metropolis. Batman, knowing that Metropolis has it's own defender, decides to study up on The Man of Steel, but only does so for 24 hours, because time is of the essence when trying to find The Joker and stop him from killing. Batman travels to Metropolis and scours the criminal underworld looking for leads to his nemesis. Supes learns that a masked vigilante is wreaking havoc in his city and decides to do something about it, all the while not realizing what impending doom is about to be wrought upon Metropolis by a maniac in clown make-up.
Batman is swinging from rooftop to rooftop and sees Superman hovering quietly in front of him with a fixated, and somewhat impressed, stare.
S: Who are you and what are you doing in my city?
B: Trying to find a maniac and stop him from killing.
S: The only maniac I see is right in front of me.
B: Leave me alone and let me do my job.
S: You're coming with me one way or another. Don't make me hurt you.
B: You won't.
Anything goes.
Superman is a boyscout and plays by the rules. He does not have any idea what kind of man he is up against.
Batman fights dirty and is not afraid to, either. He has had 24 hours of prep time to study Superman and his tactics. The Batmobile is at his ready if he needs it.
Who takes it?
(I was watching the 3 episode story arc "World's Finest" from Superman TAS dvd, and felt like making this.)