Jesse discovers he has the ability to talk to animals when he and Willy find an injured seal.

An illegal toxic waste dump on the ocean floor kills a dolphin family and poisons Einstein, a shy but super-intelligent dolphin.

A whale-stunning sonar pulse is just what The Machine needs to illegally harvest whales for their whale oil.

Annie feels that she and Jesse are growing apart so she invites him to take a cruise with her on Stone Corporation's new whale watching ship.

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 genetic research creates a giant squid named Goliath, whose purpose is to destroy Willy.