Sam, Neely and Caroline witness a military jet crash into the ocean, then learn it contained a deadly virus. They must use a new deep-water scuba system to retrieve it. Cody, C.J. and Newmie try to shut down an illegal nude beach, which causes danger for its spectators.
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.