Have An Evil Day (1) - S1.E14

Together, Joker, Clayface, Catwoman and Penguin launch a simultaneous assault on Gotham City, and then Batman and Robin when they turn up to stop them. While this battle rages on, another villain known as Zarbor, who is another imp from Bat-Mite's home planet of Ergo, steals all of the Earth's nuclear power plants.