When a woman named Gwen arrives at Mitch's tower, he hardly notices her. But Gwen spends her afternoon at his tower and makes an awkward conversation. She tells Mitch that she and her sister is visiting the beach in their trailer. When Mitch doesn't pay any attention to her anymore because he finds two beautiful girls more fun to be with it, Gwen decides to leave. When Mitch is about to close his tower, Mattie, Gwen's sister arrives. Mitch starts to like Mattie and accepts her invitation to dinner the next night in their trailer without knowing her secret. It turns out that Gwen and Mattie is actually the same person.
This long-running series follows the adventures of a team of lifeguards on the crowded beaches of Los Angeles County. Veteran lifeguard Mitch Buchannon watches over the younger lifeguards that come and go with each passing season as they keep the beaches safe for vacationers. Frequently he must take action to save them from the raging seas and from the raging tempers that sometimes flare up between the young guards in this stressful job.