KidsWBYungsta's Battle for the Animation Multiverse

When an evil shapeshifter recruits a group of animated villains to help in his ultimate takeover of the Animation Multiverse, the fate of the Multiverse lies in the hands of a long-eared rabbit, a teenage robot, a stoic samurai warrior, a pink, cowardly dog, and three kids from a cul-de-sac. Meanwhile, a black cat must find the heroes and team up with them to save the future.