A mysterious entity called the Nothing has come to absorb many universes. This cataclysm brings characters like Shaggy, Finn and Jake, Arya Stark, Bugs Bunny, Batman and others together. Shaggy befriends the cute and dependent Reindog who feeds him a crystal that grants him super-strength and powers. Shaggy must bring everyone together if they are to stop the Nothing, save their worlds, and rescue Scooby-Doo!
