In the world of comic books, there are few rivalries as heated as Batman and the Joker. The two of them couldn't be more different. Yet, within the past 75 years of their existence, there have been moments when the Joker and Batman join forces.
As unbelievable as it sounds, it's true. There are a handful of times where Batman and the Joker work together. They usually don't like it. Hell, they're within inches of killing each other most of the time, but there are some circumstances where Batman teams up with the Joker to achieve a common goal.
While it is rare when it happens, whenever the Dark Knight partners up with the Clown Prince, their opposition is royally screwed. Check out these odd Batman-Joker collaborations in comic book history.
When They Both Needed a Cure
When Batman Believed the Joker Was Framed... But Was WrongPhoto: DC Comics
When the Joker Was Framed for Killing the Penguin
When Batman Believed the Joker Was Framed... And Was Right
When They Took Down the Red Skull
When Brother Eye Merged Them