Sean faces a major life-changing decision to leave for Australia or stay with Baywatch Hawaii, while Leigh has agreed to marry Sean in a wedding ceremony on the beach.
A new computer is installed at Baywatch headquarters but could spell disaster if it is not working properly before a sponsor's visit.
Jenna gets taken in by a fast-talking con man, named Lyle Garrett, who claims to be an investment banker who wants her money for a quick IPO investment, despite Sean's suspicions who sees through Lyle's charade.
A major hurricane hits the Hawaiian islands in which Sean is trapped with Jenna in a underground bunker which rising flood waters threaten to drown both of them unless they put aside their personal conflicts and hatred of each other to survive the day and night.
Carrie's life turns upside down when after she and Leigh save two spear fishermen from drowning, after which one of them asks her out on a date in which he begins stalking her and wanting to control her.
Leigh and Sean become entangled in a dangerous position when he suspects an attractive tourist, named Sasha, of murdering her husband, but cannot prove it to anyone.
Zack becomes devastated when Sean refuses to promote him to a full-time lifeguard due to his brash and reckless attitude after rashly trying to capture a purse snatcher on the beach, in which Sean gives the promotion to Carrie instead.
Jenna intensifies her personal war against Sean by confiscating some of the team's equipment, including a Scarab, and trying to get her boss McKenna, a ruthless and greedy local councilman, to close down the Baywatch Hawaii training center.
Sean becomes concerned over Leigh's new boyfriend Sam Parks, an air plane pilot who thrives on living dangerously, and whom takes her out on a hand gliding trip headed for disaster.
A typical day begins when Kekoa deals with three rescues simultaneously one of which involve a brash and spoiled teenage wave runner who causes accidents in the area in which his equally spoiled and arrogant father threatens to sue the team for not coming to his aid in time.