This is either a new, possibly leaked trailer for Batman Arkham City. Or is this just a fan mod of the first game? Either way, who needs Robin, when the Joker can help Batman beat up the bad guys?

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This video popped up on French gaming site Jeux Video. We're left to wonder whether this is a hint of how the game's co-op will work, or if it's merely a scene of some computer-controlled Joker assistance provided to the playable Dark Knight.

We're checking with the Arkham City's publisher to find out if this video is real or just a wonderful fan-made dream team-up.

Batman: Arkham City will be out this fall for the PC, PlayStation 3 and Xbox 360. It's a sequel to the 2009's critically-acclaimed Batman: Arkham Asylum. Both games come from Rocksteady Studios.

Batman : Arkham City - Warner Bros - Trailer Fight [Jeux Video, via Twitter]