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Captain Sonny Jennings and his core team of lifeguards monitor the dangerous Hawaiian waters; new lifeguard recruits compete to join Sonny’s district; Sonny and his family grieve after the loss of his nephew; Em reveals a romantic past with Will.

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A flash flood sweeps a young tourist away from her family and out to deep sea; going against Sonny’s wishes, Em takes a bold risk and places her own life in danger in hopes of rescuing the lost -at-sea tourist.

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Em works to earn the team's respect when she is left in charge and Hina and Kainalu juggle multiple beachside emergencies; Will's fiancee pays him a visit at work; Sonny opens up to a former lifeguard about his trauma since losing his nephew.

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College kids get trapped in a collapsed sandpit; Sonny, Will and Laka race to rescue people stranded after a shark attack; Will learns if he made the cut for the firefighter job he has been pursuing.

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The lifeguards of the North Shore experience the most dangerous ocean conditions the district has seen in years; Sonny assigns Laka as acting lieutenant; Kainalu's father pressures him to leave his shift and help him with his campaign.

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The North Shore community comes together for Rocky's paddle out; Hina thinks about switching districts; Laka, Will and Kainalu try to save a beachgoer that accidentally speared his own foot; romance heats up between Sean and Em.

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An influencer gets swept into the ocean while trying to film a new video; Kainalu and Hina discuss setting boundaries within their home; Mayor Emerson makes good on his word with Captain Sonny; Jenn finally agrees to go on a date with Laka.

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Sonny, Em, Will and Laka look for missing paragliders that were pushed into the ocean by a down draft; Kainalu invites Hina to a party with his ex-girlfriend; Jenn doesn't think Laka is serious enough for her; Sonny puts in his notice to retire.

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Christmas cheer is in the air as the lifeguards prepare for their annual holiday toy drive; while surfing, a local grandpa has a heart attack and is rushed to the hospital; Sonny tells Laka he is not ready to become a lieutenant.

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The team races to the rescue in the aftermath of an ATV accident; romantic tensions are high between Em and Will as well as Kainalu and Hina.

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Em and Will's relationship struggles as they navigate the return of his fiancée; Kainalu asks Laka for help; the team races to rescue a group of locals involved in a serious accident while riding an inflatable Supsquatch.

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The team is on high-alert when a tsunami advisory is sent out following an earthquake. As the state of Hawaii is under an evacuation order, Captain Sonny has bigger issues when Ocean skips school and he can't find her.

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