Batman, Batgirl and Robin forge an alliance with The Teenage Mutant Ninja Turtles to fight against the Turtles' sworn enemy, The Shredder, who has teamed up with Ra's Al Ghul and The League Of Assassins.
I thoroughly enjoyed it. There was plenty of injected humour, which a lot of these type of movies lack, which worked well for me. The characters (all of them) became a little more rounded as a result of the interaction with the mischievous Turtles. It was very good fun