When the Justice League goes missing and villains overrun Metropolis, there’s only one team that can solve this mystery: Scooby-Doo and the gang! But wait, there’s a new dog in town – Krypto – Superman’s Superdog with Super Powers. Mystery Inc. will need all the help it can get when phantoms menace the Justice League’s headquarters. And has Lex Luthor finally gone straight? Or is he in cahoots with The Joker and Harley Quinn? The DC Super-Villains may have clashed with Superman before, but now they’re facing something new: a gang of meddling kids!