When Mitch and Cody have rescued a little girl, it all turns out to be just another training exercise for some kids. While doing this, they are observed by Alex's nephew Timmy, who is mildly autistic and doesn't speak. Timmy loves dolphins and his mom Valerie is taking him to Hawaii where he can visit Dolphin Quest, an organization specializing in providing young children the opportunity to swim with dolphins. When Valerie arrives to the beach and tells Alex that she can't get away from work, Mitch convinces Alex to take Timmy. Cody joins them to participate in an outrigger race. At the Dolphin Lagoon, Alex and Cody want Timmy to swim with the dolphins but he is afraid of the water. When Cody and Alex turn their back on him, he suddenly disappears. They find him with an artist named Wyland who also happens to like dolphins. Later, Cody meets Kali McKenzie, who tells him the outrigger race has been postponed due to a storm. Now Cody does not have any plans so Kali decides to give him a guided tour around the islands. When a boy falls off a cliff and ends up in a cave, Cody and Kali must work together to save him. When they return to the beach, Alex goes to help them out and forgets about Timmy for a couple of seconds.

Timmy sees a girl knocked out cold by a windsurfer. He is able to bring her to shore and perform CPR before Cody and Alex arrive. Before they leave Hawaii, Timmy receives a painting from Wyland and also gets the opportunity to see a pregnant dolphin giving birth. Before Cody leaves, he says goodbye to Kali; although attracted to each other, they decide to put their feelings aside. When they return to Los Angeles again, Timmy shows the painting Wyland gave him to his mother. Timmy utters the word "Mama" to her as he touches the painting and then his mother's heart.

While Mitch and Newmie are walking down the beach, Mitch tells Newmie about a confrontation he has had with a gang. He tells Newmie that he talked them out of returning. Then suddenly Mitch's tower explodes. That is a warning from the gang. Meanwhile, April meets two tourists from Salt Lake City on the beach. They are named Sherri and Vic. Sherri wants to paint while Vic goes for a swim. When the swells are getting bad, April warns Vic but he assures her he is a good swimmer. A while later however, Vic gets swept under by the growing waves. April tries to rescue Vic but the waves are too big. When April resurfaces, Vic is nowhere to be seen. Many lifeguards arrive to the beach to search for Vic, but they are not able to find him anywhere. Mitch feels sorry for Sherri and promises her to continue the search the next morning. Mitch decides to escort Sherri to her hotel where she tells him that she is pregnant. Later at headquarters when April tries to comfort Sherri, she confronts April and blames her for Vic's death. When Vic's body finally is recovered, Sherri knows for sure he is dead.

When Jessie and Alex walk by a group of convicts working on a chain gang, Jessie keeps staring at one of them named Deke. When Jessie and Alex have walked away, Deke's partner Garcia fakes a stomach-ache. When the security guard approaches Garcia, Deke knocks him down and the two convicts are able to escape. Deke decides to hide himself in Jessie's tower. It turns out that Deke is her ex-boyfriend and now he wants Jessie to follow him to Mexico. She makes him believe that is what she wants as well. But it all turns out to be a trap because Jessie has alerted the Coast Guard. Deke tries to escape by climbing up a cliff followed by Newmie. When Deke almost falls down, he is rescued by a Coast Guard helicopter and returned to prison. Jessie tells Mitch and Alex about her life with Deke. They let her stay in rookie school.