Jungle-dwelling natives find two long-haired bearded men dressed in frayed tuxedos asleep on the jungle floor and carry the men to their chief and his daughter who insists on protecting them. She mimes instructions that the men are to be dressed, shaven and given haircuts, all of which is done while they are still asleep. Upon waking up, the men — Duke Mitchell and Sammy Petrillo — introduce themselves to the chief's daughter Nona and recount that they were on their way "to do a show for the boys on Guam", but opened the wrong door on the plane, fell out with their parachutes and have been living on wild berries and raw fish. Nona explains that her father is Chief Rakos and "this is the most southern fringe of the Zambuanga Group — the Island of Kola Kola".
At that evening's luau, Duke establishes a closer relationship with Nona, while Sammy is introduced to Nona's overly-friendly plus-size "baby sister" Saloma, causing him to jump up, join the luau dancers and then perform a comedy routine, followed by Duke's rendition of "'Deed I Do". Afterwards, Nona tells Duke that she was educated in an American college to prepare her for ruling the island as its queen. When Duke inquires about leaving the island, Nona says, "perhaps Dr. Zabor can help you. He's the only white man on the island. He lives on the other side of the island. He's a scientist working on an experiment in evolution. He hired me as his assistant. Tomorrow I shall take you to him." In the meantime, Saloma continues to chase Sammy through the jungle and kisses him goodnight while Duke and Nona share a kiss.
The following morning, upon arriving at Dr. Zabor's Dracula-like castle, Nona, Duke and Sammy are let in by the tall, heavily-built native servant Chula who goes to inform Dr. Zabor. When Dr. Zabor comes out to greet them, Duke thinks he knows him and Sammy reminds Duke, "Ain't this the fellow that goes around with the hand and the faces, biting people on the neck and wearing capes?" "You're crazy", replies Duke, "Watch out for bats", shouts Sammy. Dr. Zabor offers to help Duke and Sammy leave the island and offers them the hospitality of his castle and the use of his wardrobe.
In the laboratory, Dr. Zabor insists to the reluctant Nona that "You shall love me" as Chula ushers in the re-dressed Duke and Sammy who become interested in Dr. Zabor's caged chimp Ramona. The castle is visited by the island's law representative, Pepe Bordo, who has the only "wireless outfit" and promises to communicate with a passing ship. As Dr. Zabor accompanies Pepe Bordo to the outside, Duke and Nona kiss while Ramona pulls Sammy into her cage and locks the door.
In the evening, Duke walks Nona back to her village, Dr. Zabor drinks and broods over Nona's reluctance and Sammy goes to bed alone, but Ramona opens her cage door, leaves the laboratory, goes upstairs and climbs into bed with Sammy who winds up spending the night with Ramona in her cage, while Duke returns and goes to bed.
On another evening Dr. Zabor and Chula arrive to share a meal with Chief Rakos, Nona, Saloma, Duke, Sammy and the witch doctor. As Nona and Duke go outside, Dr. Zabor sends Chula to spy on them, while Saloma encourages Sammy to go out so she can meet with him. As Chula listens, Duke proposes marriage to Nona and sings "Too Soon" to the melody of "La Paloma". Chula returns, Dr. Zabor puts on his black cape, leaves and listens to Chula describe Duke's and Nona's marriage plans. Back in the laboratory, Dr. Zabor injects Ramona, reversing evolution and turning her into a small monkey with a tail.
The following morning, as Nona returns to the laboratory, Dr. Zabor realizes that the serum's effect was only temporary and Ramona has turned back into a chimp. Meanwhile, Duke is on his way to see Pepe Bordo, but is ambushed by Chula who carries him to the laboratory where Dr. Zabor tells Nona that the day's work is done and that she should take Sammy to the village and after they leave, injects Duke with the serum and watches him turn into a gorilla.
As Nona and Sammy return to the laboratory in search of Duke, Dr. Zabor explains that the gorilla is actually Ramona advanced to a higher level of evolution. He and Nona start out for the village, leaving Sammy in the laboratory with the gorilla who uses charades in pantomiming to Sammy that he is really Duke. Sammy still cannot understand until the gorilla launches into a gravelly rendition of "'Deed I Do". Sammy unlocks the cage, the gorilla knocks out Chula who later awakens and goes to the village to warn Dr. Zabor. Zabor and Chula return to the castle to find Sammy and the gorilla running away, pursued by a lovesick female gorilla. Dr. Zabor takes a rifle and goes in pursuit.
Upon reaching the village, Sammy explains to Nona that the gorilla is really Duke and she embraces the gorilla, but just then Chula arrives with Dr. Zabor who aims the rifle at the gorilla. Sammy shields the gorilla with his body and is mortally wounded. As the gorilla kneels over Sammy and pats his face, the scene shifts to Duke shaking Sammy awake and, in answer to his questions, explaining that they are in the dressing room of The Jungle Hut nightclub in Passaic, New Jersey and "we're on next... come on!" In the hallway, Sammy sees Nona returning at the finish of her gorilla trainer act, with Chief Rakos in a gorilla suit, removing the gorilla head and complaining. He then meets Pepe Bordo who is now a waiter and runs into the tall Chula, wearing a tuxedo, who brusquely tells him, "Hurry it up... you're on next". Dr. Zabor is the manager who advises him, "You'd better get some laughs this time or you'll be collecting unemployment insurance". Finally, Saloma, a dancer in a Polynesian act, embraces Sammy, gives him a big kiss and, this time, he likes it as he and Duke perform their act with another rendition of "'Deed I Do".
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