On a trip to Washington D.C., the gang is accidentally locked into the Splitsonian Institute, where they track a set of mysterious footprints.

The Mystery Machine skids and runs into the Happy Humor Ice Cream factory, leading the gang into a mystery involving chocolate, vanilla and strawberry-flavored gorillas and some missing armored trucks.

A star athlete vanishes off the field during a game, leading the gang on a journey into underground tunnels and trapdoors.

While on a cruise on Professor Poisson's boat, the "Sea Prowler," the gang encounters a nautical ghost and an undersea treasure-trove.

The gang goes on a water-skiing outing to the Aqua Land marine park and becomes involved in the mystery of the Shark Demon, a shark/human monster.

The gang encounters a flying bull and a gang of cattle rustlers while visiting Daphne's uncle at a ranch.

The gang goes to Seattle to investigate demons in an underground city and embarks on a wild ride on underground streetcars.

At a plantation, the gang investigates the curse that seems to linger over a rock group.

Scooby sees a faceless zombie steal the "Golden Galleon" from a coin shop, leading the gang to the Dilly Dally Dolly Company.

A trip to Niagara Falls lands the gang in the middle of an adventure involving a mysterious sanitarium and the ghost of a mad doctor.

Jewel thieves hide out at a reconstructed English castle and use the ghosts of Merlin and the Black Knight as a cover.

In Sleepy Hollow, the gang investigates the legendary Headless Horseman when he shows up at a Halloween costume party at Crane Manor.

Scooby and the gang investigate when an electric ghost sabotages the local power plant at a ski resort.

The gang visits Ma and Pa Skillet on a down-south showboat restaurant and run into the Gator Ghoul, an alligator-headed monster.

The gang searches for a missing treasure while on their Mexican vacation.

Scooby and his friends hunt a gang of safecrackers using a haunted construction site as a vantage point.