Batman Unlimited: Animal Instincts

The film starts with an announcement of Gotham City's "newest and tallest building", the Aviary built by the Penguin as well as an asteroid called the Midas Heart passing by earth once every 77 years and Batman on patrol. However, a robotic wolf overtakes the guards and breaks into S.T.A.R. Labs to steal a power generator until Batman show up to stop it, but the wolf gets away. Over at the Gotham Jewelry Store, Nightwing (Dick Grayson) sees Cheetah steal some jewelry they start to fight until Killer Croc joins in. Right when they're about to leave, the Flash (Barry Allen) shows up to help even if Nightwing rejects him. Flash throws a flurry of punches on Croc, but Croc thinks they tickle and KO Flash. Once the 2 villains leave, Flash states he's been tracking Croc after he robbed a copper quarry.