C.J. is almost run over in a race, causing Mitch and Newmie to finish; Lewiston is engaged to a princess; Catherine's bodyguard Roland kidnaps her.

An actress, who is running from two crooks, is saved by Mitch. He decides to help her capture them; Guido attempts to convince his visiting mother that he is a lifeguard.

While strange earth tremors plague the area, Mitch tries to get Jordan to meet her real biological mother on a fishing outing, who turns out to be a white woman named Rene, who's dying from a brain disorder and thinks the problem is hereditary. But things take a turn after a massive rouge wave, triggered by an underwater tremor, capsizes the fishing boat and traps Rene below decks in a room with toxic fumes.

Cody becomes consumed with guilt when his actions of leaving his post before the end of his shift to go on a date with Lani result in the disappearance of a young Latino woman swimming in the ocean, and the incident results in a hyped media circus that comes to the beach to cover the story.

Mitch rescues a troubled young woman, named Sara, from her boat after it catches afire after which she charms Mitch and gets his mother, Irene, to hire her as a nanny for Neely's baby, Ashley. But Mitch gets concerned when Sara quickly develops a dangerous obsession with him and tries to win his affections at any cost. When Mitch lets Sara down, she immediately shows her true colours and plots to make Mitch's life a nightmare.

Mitch deals with Captain Alexis "Alex" Ryker, the conniving CEO of a private lifeguard company called Bayguard, who wants to take over the Baywatch lifeguard company to expand her company. When Mitch suspects Alex of setting up rescues to appease Chief Johnson, he resorts to having Cody spy on the Bayguard team to uncover any underhandedness.

While on her way to her grandmother's birthday party, Alex's day gets sidetracked when she tries to save a diamond runner, named Ben, whose partners, Lisa and Jason, want to silence him for good which leads to a standoff in an underwater cave with Alex and Ben trying to avoid the rising tide and the smugglers circling above in their motorboat.

April tries to save Manny from himself after he suffers a life-altering back injury during a rescue. April then decides to take Manny's place with Hobie in a boat race with the other lifeguards from Baywatch.

A frantic weekend begins for Alex when she begins tracking down the builder of several elaborate sand castles that appear every day at the beach, while she gets stuck entertaining her life-long childhood friend Sam's fiance, Diana, who falls for Mitch, which prompts Mitch to asks Alex to pose as his girlfriend to keep Diana away.