A cosmic case of flying saucers, intergalactic intrigue and out-of-this-world romance launches Scooby-Doo! and the Mystery Inc., Gang into their most unearthly adventure ever.

Yogi and Boo Boo awake from hibernation on Easter morning. Yogi brags that his ancestor gave the Easter Bunny his start, and drags out the family album to begin his story.

Scooby-Doo and the Mystery Gang visit Oakhaven, Massachusetts to seek strange goings on involving a famous horror novelist and his ancestor who is rumored to have been a witch.