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.
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.
Allie discovers a rare Hawaiian coin from a ship that sank after the Pearl Harbor attack. Sean lets the team dive for sunken treasure provided it doubles as a training exercise. The deep-sea dive leads to discord, dissent and explosive danger.
The Team hunts men mutilating sharks for their fins. Jason, who's always feared sharks, learns to accept the local tradition that sharks are sacred protectors of the Hawaiian Islands.
Sean is faced with a life-or-death decision during a daring cave rescue in which Kekoa faces her greatest fear. Hobie plans to get married, but Mitch is at odds with his fiancée's obnoxious parents.
Sean threatens to kick Jason off the team after Jason defies his orders and makes a daring rescue. Allie, Dawn and Nick have to save a drowning man and his pregnant wife about to give birth in the ocean.
Jessie and Kekoa battle each other even as they rescue a man stranded behind a waterfall! Sean and Allie search for treasure. JD and Jason help two girls save a cat caught on a boat mast, but wind up catapulting it across the water!
Sean leads Team Baywatch on a daring night rescue in shark-infested waters to save 6 kayaking teens stranded off the perilous Na Pali coast.
Tanner believes The Shark Island Legend. Mitch doesn't. Team Baywatch competes with the Coast Guard. Jessie and Kekoa both dump JD. Swimming naked in a Hawaiian purification ritual, Jesse has to make a rescue in the nude.
Tanner visits Mitch, tours the Islands, and befriends a dying girl. After failing her initial "test", Dawn challenges Sean to a dangerous contest with her future at Baywatch hanging in the balance. JD competes to join the America's Cup Sailing Team.
Amidst chaos, the new Baywatch Hawaii team must learn to work and live together. Jason meets a man with a mysterious past. A girl Mitch saved suffers from secondary drowning, leading to a critical test of the new recruits.
While team Baywatch prepares to compete against the Australian guards, Jake must choose between staying down under with his son or returning home. The competing lifeguards must put their intense rivalry aside to save a life.
After Mitch's lifeguard buddy's ex-wife dies in Australia, Mitch and the team accompany him on a trip down under to meet the son he's never known.
Mitch feels the need for speed when Tanner's cousin, Damon Lusk, a race car driver in town for a major competition, visits Baywatch. Meanwhile, Newmie and the gang develop a TV show about lifeguards that they try to sell it into syndication.
When caught up in a high-risk adventure at sea, Craig tells Mitch a shocking secret. Meanwhile, Jessie works to creatively end JD and Cody's rivalry during a beachside triathlon, and April comes clean with Manny.
After he tries to save Tanner from his abusive father, Mitch ends up on the wrong side of the law. Meanwhile, Jessie's irresistible charm makes a stunt pilot's heart take flight.
Mitch tries to reunite an Army parachutist with her estranged Naval-officer father, while Cody helps a beautiful woman try to reach record-setting depths at a national free-diving competition.