Reports of a coming storm and enormous waves bring painful memories for Mitch. Meanwhile, Kaye tries to persuade the parents of a deaf girl to send her to sign-language school.
Drug lord Mason Sato is released from prison and determined to seek revenge Mitch Buchannon, who helped send him away. When Sato kidnaps Hobie and Kaye, Mitch and Sato end up in a samurai-style fight to the death.
Eddie slips on sand and hits his head on the tower ramp. When he regains consciousness, Eddie finds himself on an island with Gilligan, Mary Ann and the rest of the castaways.
After helping break up a gang fight on the beach, Eddie gets the idea of having some gang members join the lifeguard W.A.T.E.R. program designed to help troubled youths.
Mitch receives an unexpected visit from his free-spirited brother, whose troubled son entices Hobie to surf the pylons of a treacherous condemned pier. Meanwhile, a local vendor nearly causes a riot when his bikinis disintegrate in the water.
After Mitch makes a heroic ocean rescue while working at her private beach party, a Hollywood producer offers Mitch the starring role in a movie. Meanwhile, Harvey and Shauni hold a wild bikini contest to raise money for an aquatic rescue group.
After Baywatch lifeguard Megan is attacked on the beach, she struggles to regain her confidence – unaware that her attacker, a fisherman, views her as the "One That Got Away." Meanwhile, Shauni suffers from lifeguard burnout.
When a fishing trawler mysteriously sinks, the “Creature in the Bay” is thought responsible! Mitch, Devon and Captain Thorpe set out to prove there is more than meets the eye behind this Creature's mysterious attacks.
'Nightmare Bay, Part 1'' - Mitch rescues an underwater photographer that appears to have been attacked by a Sea Creature in an underwater cave, resulting in a media frenzy. Shauni rescues a young girl in the ocean then has to rescue her family from drowning.
A massive earthquake destroys Baywatch headquarters and leaves Gina's life hanging in the balance. Meanwhile, Cort and Craig are trapped in the ocean. And Eddie is the only one left who can help a pregnant woman going into labor.
Craig, Mitch and Garner go for a weekend hang-gliding trip, but Mitch has a serious accident, and ends up facing death before the fangs of a rattlesnake! Cort reacquaints himself with a woman who has a shocking secret.
Mitch gets a surprise visit from his old, mischievous Navy S.E.A.L. buddy and ex-Baywatch lifeguard, John Cort, adding serious problems in their already complicated relationship. And Shauni and Jill fight a battle of the sexes against a shady vendor.
Jill teams up with Trevor to win a beach volleyball tournament, but all she really wants is to beat her former lover's team. Eddie and Shauni team up to rescue a young girl trapped in an armored car that topples off the pier into the ocean.
Craig gets jealous when Mitch reunites with his and Craig's old flame. Meanwhile, Eddie buys a classic Mustang for cheap, only to get arrested for possession of a stolen car.
During a tropical storm, Eddie and Shauni take refuge in the Pomeroy's loft, turning a cold night into the start of a hot romance. In the downpour, two escaped convicts shoot Garner, then break into Baywatch headquarters and take everyone hostage.
Eddie warns Shauni that her new boyfriend Andrew is not a good guy. She ignores Eddie until Andrew gives her a black eye. Meanwhile, Craig and Mitch must stop an out of control party boat before it crashes into the crowded Santa Monica pier.
While housesitting for Craig and Gina, Eddie takes in a runaway whose life is threatened by her mobster boyfriend. Meanwhile, Trevor enters Baywatch rookie school to become a certified LA County lifeguard.
Several people are murdered at the beach by a mysterious man in ghoulish make-up and Eddie is knocked unconscious by what he describes as a "cretin." Eddie's report is met with skepticism until the identity of the killer is dramatically revealed.
Craig rescues a woman that develops a fatal attraction to him, placing Craig's wife in mortal danger. A fishing trip goes horribly wrong when the boat explodes and Mitch and his mentor Al have to rescue its passengers, including Mitch's son Hobie.
Sean has a decision – move to Australia or stay in Hawaii. Zack sees Leigh naked, leading to complications with her fiancé Sam. Kekoa dumps JD and become a party girl. When Sam leaves Leigh at the altar, Sean asks Leigh to marry him instead.