A museum curator and two geology students impersonate Viking ghosts to keep people away from a lake and steal the area's thermal energy.

The gang visits a friend on a forbidding island reputed to be the home of vampires.

During a hang-gliding competition, the gang investigates ghostly dinosaurs and cave-men in a Western canyon.

The filming of Scooby-Dee's new film is disrupted when a phantom appears on the set.

Shag and Scooby play decoy to uncover the truth behind a phantom racer and some disappearing racecars.

The gang spends a stormy night at Hatfield's cabin, only to see a witch transform their host into a frog. Searching for a solution, they encounter a zombie and a witch's cave.

The gang wins a South Seas cruise and stumbles upon a mystery involving a time machine and a futuristic monster.

A huge sea monster disrupts the kids' beach party, but when they take refuge in an old house they run into a ghostly sea captain whose spirit has been stolen by the monster.