While vacationing on a sailboat, the kids aid Naval Intelligence to halt the mysterious disappearances of airplanes.

A terrifying Sea Beast frightens divers near Acapulco's famous cliffs.

A frightening alligator-headed monster scares the customers and employees away from a popular Southern restaurant.

A spooky fog and a huge sea monster end the kids' party on a deserted beach!

The gang's tropical island vacation gets ruined when they stumble across a boat-smashing sea monster. The terrifying ocean creature, Notto Mori, is reputedly the "spirit of the island."

Scooby-Doo and the gang accompany a penguin back to its home in Antarctica and find a finned creature from the sea dragging victims to an icy fate.