- When a surfer arrives on the island, the castaways encourage him to head back to Hawaii and rescue them. However, he is more interested in making moves on Ginger and Mary Ann than in getting back in a hurry.
- While fishing at the Lagoon, Gilligan (Bob Denver) and Skipper (Alan Hale Jr) witness a surfer ride up and collapse on the beach. With the help of the Professor, they revive him and discover his name is Duke Williams (Denny Scott Miller) from Topeka, Kansas who was lost surfing near Waimea Beach, Hawaii. The Professor deduces he rode a tsunami wave for five days to get to the island. Thinking he's stuck on a deserted island with only men, Duke vows to build himself up and surf back home. Gilligan encourages this, but after he and Duke leave, the Professor explains to Skipper this Duke's plan is highly unlikely. Back at the boy's hut, the Skipper unsuccessfully tries to convince Duke he's stuck on the island. However, it's not until the girls voyeuristically swoon over the surf stud flexing his muscles that Duke decides he wants to stay. Meanwhile, Gilligan carries the news to the Howells (Jim Backus and Natalie Schafer) who mistakenly think a regal Duke has arrived and dispatch the flustered first mate to invite him for cocktails. Down at the beach, Duke fascinates the swimsuit clad girls with his stories and physique, and when Gilligan runs up, he smashes into Duke and collapses on the ground. Duke lifts him up and smugly flexes his bicep inches from Gilligan, who decides to build his own barbells and develop his body. When the Skipper spots Gilligan lifting coconut shell dumbbells, he urges him to try a heavier bamboo-and-boulder weight. Down at the beach, Duke performs a feat of strength lifting the girls from his shoulders when he hears the helpless cries of Gilligan who has trapped himself beneath the bar. Duke frees Gilligan then demonstrates the lift himself as the girls watch enraptured. After Gilligan fails again, Duke and the girls head back to the beach leaving Gilligan alone. That night, Duke meets the Howells for cocktails. They tab him as a royal impostor, and he considers them loony and leaves quickly. He reconvenes with the girls and is doing push-ups on the communal table when the Professor (Russell Johnson) arrives with news that reverse tsunami is heading toward Hawaii in thirty-six hours. Gilligan is thrilled, but Duke dismisses the idea and leads the girls off for a moonlight stroll. The next day, Duke makes a move on Ginger (Tina Louise) while she is in the jungle picking flowers. When he won't take no for an answer, she runs off and warns Mary Ann (Dawn Wells), who disdains the advice thinking Duke is harmless. She goes off looking for him and returns moments later also frightened. Ginger suggests they seek the counsel of Mrs. Howell in how to dissuade Duke's advances. After some contemplation, Mr. and Mrs. Howell concoct a plan to make Duke jealous by pairing the Ginger with the Professor and Mary Ann with Gilligan. That night as Skipper waxes the surfboard, Duke appears looking for the girls, and the Skipper lets him know that the girls have returned to their "old beaus." When Duke spots the pairs on dates in the jungle, he agrees to leave the island the next day. The following morning, Professor gives Duke provisions and he shoves off for Hawaii. Watching from a tree Gilligan sees Duke catch the wave and head out to sea. Everyone is expecting to be rescued. Five days later, though, the men are disappointed as they hear that Duke has landed in Hawaii but has hit his head on a rock and suffered amnesia! And he doesn't remember where he was or who he was with.
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