Examines myths and legends about sea monsters; explains what sea monsters are; describes the kraken, the leviathan, the Loch Ness monster, mermaids, and similar creatures; and discusses theories that are used to explain reports of sea monsters.
Describes sightings of unidentified water creatures, including the Biblical Leviathan, sea serpents, and the monsters supposedly inhabiting various lakes.
On a special after-hours tour of the Coolsville Aquarium, the gang tries to catch the Fishy Phantom, who has stolen the aquarium's rare rainbow flounder.