Jesse discovers he has the ability to talk to animals when he and Willy find Lucille the seal has been injured.
The Machine's illegal toxic waste dump on the ocean floor kills a dolphin family and poisons Einstein, a shy but super-intelligent dolphin.
The Machine's new whale-stunning sonar pulse is just when he needs to illegally harvest whales for their whale oil.
Marlene learns to trust Willy as she and the killer whale must work together to rescue Jesse from a deep labyrinth of caverns.
The Machine's improper genetic research creates a giant squid he names Goliath, whose purpose is to destroy Willy.
Lucille thinks it is fun to be human, and to make more human friends she volunteers for a water circus.
The Machine is attracting thousands of sharks to the Misty Islands in hopes of ruining the tourist economy.
Jesse faces The Machine who is trying to wipe out all the salmon in the Misty Islands by illegal clear cut logging.
The Institute's battle against illegal fishing takes a political turn as our heroes use the law to stop illegal drift netting in international waters.
Jesse finds a gold doubloon and is gradually overcome by gold fever as he and a reluctant Willy search for pirate treasure.
Frustrated in their quest to unmask The Machine's true identity, Jesse and Willy stumble on a clue from The machine's past: an unearthly ghost ship full of volatile war material.