April suffers PTSD after losing a rescue victim. Mitch and the victim's widow refuse to give up searching for his body. Jessie runs into an old beau who could undermine her future at Baywatch.
A mysterious lifeguard makes rescues around Baywatch, then vanishes. After going over Mitch's head one too many times, Alex gets an annoying new partner.
Cody accompanies Alex on a vacation to Hawaii where she wants to take her autistic 10-year-old nephew, Timmy, to swim with dolphin in the local lagoon. Cody spends quality time with Lani's sister, Callie, a local Hawaiian lifeguard.
Captain Alexis "Alex" Ryker, the conniving CEO of a private lifeguard company, wants to take over Baywatch to expand her private lifeguarding empire. Mitch suspects Alex of setting up fake rescues and recruits Cody to spy on the BayGuard team.
After a swimmer shows symptoms of a deadly virus, headquarters is quarantined, trapping Mitch, April, Donna and JD inside with an annoying salesman. With JD waylaid, Newman takes on his plum assignment overseeing a photo shoot of sexy models.
Cody makes a crazy bet with some local hotshots. Mitch risks his uncle's new Scarab in a wild race. Meanwhile, Neely and her baby daughter Ashley move in with Mitch for a couple of days sparking a twist to their relationship.
Garner enlists Mitch's help to track down and capture a ring of drug smugglers operating from a boat offshore. The stakes get deadly when Neely goes undercover to plant a bug and her cover is blown! Lani struggles to come to terms with her deafness.
Mitch uses Hobie to initiate a relationship with Hobie's horseback riding instructor. Cody, JD, and Lani try to make extra cash in a scheme to collect Sea Urchins, but when another diver gets into trouble, Lani puts her life at risk to save him.
After breaking up with Manny, April finds romance with Craig, who is having a mid-life crisis. While working together to catch a trio of wild men on waverunners harassing swimmers, Craig and April's passion heats up.
Mitch learns that a cache of US Marine weapons has been stolen and probably hidden offshore. Mitch and Cody locate a sunken vessel with the arms on board, but before they can confiscate them, they are taken captive.
Prejudice threatens Manny and April's relationship, driving April into Craig's comforting arms. An encounter with sharks leads Craig and April to take shelter in a water treatment plant's intake pipe where they encounter even more danger!
Caroline's truck is hijacked by a young thief who forces her to drive him on a wild getaway chase. Neely reveals a shocking secret about her outrageous actions during her hiatus from Baywatch.
April is devastated by her younger brother Charlie's terminal illness. Mitch and Hobie want to make sure Charlie's wishes are granted, and that the time he spends with the lifeguards at Baywatch is the best of his life.
Mitch, Sky, and April find a dead man on the ocean floor. Their search for answers to his demise leads to the retirement home where he lived, and his two friends who seem to be hiding the true story. The chemistry between Cody and Lani heats up.
Veteran lifeguard Jack 'JD' Darius has a dark secret in his past. He comes to Baywatch to throw his rescue can in the ring for the open Lieutenant slot, but young and ambitious Taylor Walsh also wants the job, and she's ready to fight for it.
Hobie, Lani, April and Skylar are among the trainees competing for a few open slots as Baywatch Lifeguards. Hobie isn't sure he wants to follow in his father's footsteps, but when a vengeful jet skier comes after April, Hobie comes to her rescue.
Young, ambitious and sexy lifeguard candidates compete for a chance to attend Rookie School. Mitch is offered a promotion to Captain and has a tough decision to make. Lani McKensie faces the sinister return of a former lover.
A mysterious, disfigured man whom the public dubs "the phantom lifeguard," is secretly saving people and sending love notes to CJ. When CJ goes missing the team sets out to find her and the “phantom.”
A crazed young woman is causing trouble on the Venice Boardwalk and Neely suspects it is more than meets the eye. Meanwhile, Newman meets his dream woman – who doesn't speak English.
Caroline finds herself being sued for negligence in civil court by the angry and bitter mother of a drowning victim. CJ babysits a neighbor's newborn and realizes she wants to be a mother. But is Cody ready to be a father?