During the hottest day of the summer, Craig has to choose between his career as a lawyer and the job he loves being a Baywatch lifeguard. The choice is made when two boys get trapped in a storm drain which is rapidly filling with water.
Playing hooky from summer school, Lt. Mitch Buchannon's son Hobie gets dangerously involved with reckless jet skiers.
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.
Zack corrupts the headquarters' computer system forcing everyone to work in the Dark Ages. Sean is freaked because a major donor is about to arrive in the midst of chaos. Jason saves Brit from her ex.
Jenna invests all her money with an investment banker who turns out to be a con man. Derek Hart is the kind of man JD wishes he was. But when Derek jumps off a cliff, JD and Jason dive in to save his life, in more ways than one!
A hurricane hits Hawaii. Sean and Jenna get trapped in a WWII bunker and must put their hatred aside and work together to escape. Zack is trapped in headquarters with a thrill-seeking reporter that puts their lives in danger to get her story.
Baywatch faces two bizarre lawsuits. Kekoa's father wants her to break up with JD and quit lifeguarding. Zack runs the new Junior Lifeguards program. A government Investigation puts Sean's job, and the future of the Training Center in jeopardy.
Carrie rescues a spearfisherman who starts obsessively stalking her. Sean, Jason and Zack save her from his deadly pursuit, but can Carrie feel safe saving strangers again? Sean is jealous of Sam dating Leigh, but Leigh has doubts about Sam.
A series of fake rescue calls puts Sean, Jenna and Zack's lives in danger. Jenna replaces Councilman McKenna, giving her the power to shut down the Training Center! JD tries to get Kekoa's father to bless their relationship.
Leigh suspects Sasha, an attractive tourist, of murdering her husband. Betraying Leigh, Jason seduces Sasha with shocking results! Sean is shocked when he discovers the truth about his ex-wife's visit to Hawaii.
Zack is devastated when Sean promotes Carrie instead of him. Zack and Jason befriend a man and his teenage daughter who harbor a dangerous secret. Zack supplies a boat to escape to Maui, but disaster strikes before they get there.
Sean and Jenna clash when she tries to close Baywatch so investors can develop the property. Carrie is afraid she's not lifeguard material after her reluctance to jump into the water from a hovering helicopter.
A teenager's waverunner causes accidents and his father threatens to sue Baywatch for not rescuing him ahead of his victims. JD takes out his personal problems on Sean. Zack relentlessly pursues Carrie while she pursues Jason.
Sean clashes with Jenna. A new love triangle emerges between new recruit Zack and rookie hopeful Carrie, who's more interested in Jason. Sean and new lifeguard Leigh Dwyer confront daredevil Cliff, whose dangerous antics disrupt the Baywatch team.
Mitch goes undercover to stop an ex-Navy SEAL turned eco-terrorist from detonating a deadly underwater explosive device. When Mitch's dive gear floats to the surface, Sean and the team fear the worst.
No longer able to cope with his guilt of surviving the attack on Pearl Harbor, Jessie's grandfather comes to Hawaii to end his life. Can Mitch intervene in time? Kekoa and Sean help a college basketball player learn to swim.
Sean tries to keep his relationship with Jenna a secret. When the team has to rescue swimmers trapped in a filtration tube, Jenna is sucked down a shaft and Sean risks everything to save her, revealing his darkest secret.
Jessie tries to overcome her condition to compete in the Maui triathlon with Dawn as her coach. Allie suspects an agenda behind Dawn's motives. Jason and Kekoa seek a mysterious underwater Hawaiian spirit that lures people to their deaths.
Sean reveals a secret to Jenna that could threaten his job. Allie and Jason fly her helicopter to the big island where they have to rescue four people trapped on a volcanic lava reef.
Allie is terrified she may lose the love of her life when Nick gets the bends in a daring attempt to rescue a mini-sub on the ocean floor.