In tracking down the Foot Clan, the Ninja Turtles arrive in Gotham City and there they team up with Nightwing, Red Hood, Red Robin and Robin to stop the war between Ra's al Ghoul's League of Assassins and Shredder's Foot Clan to the destruction (Ra's plan) or conquest (Shredder's plan) of the city while also trying to solve the mystery of the disappearance of their mentors, masters and adoptive fathers Batman and Splinter.
