Gilligan and the Skipper plan to join the Navy when they are rescued. However, when weighing themselves, they discover that Gilligan must gain weight, while the Skipper must diet.

Gilligan's thinks he is doomed after being bitten by a yellow and green bug. Soon, the other castaways are also bitten by the same bug.

A radio bulletin states that the minister who married Thurston and Lovey Howell (the Reverend Buckley Norris of Boston) was a fraud, and that the Howell's marriage is actually null and void. The stress causes disagreements and separations between the Howells. In the end, it turns out that the radio announcer was at fault: While he mistakenly reported that "Buckley Norris" was the fraudulent minister, he was supposed to say "Borris Nuckley."

Gilligan bumps his head and suddenly sees everything upside down. The Professor tries to help by brewing an antidote made of keptibora berry extract, but the antidote causes Gilligan to see double. After consuming more juice, he sees four of everything. Meanwhile, the island is invaded by three headhunters who slowly capture all of the other castaways. Gilligan saves the day by serving the headhunters lots and lots of keptibora berry extract, which causes them to see ""hundreds"" of castaways running toward them!

The Castaways hear on the radio that the Maritime Board of Inquiry has blamed the Skipper for the Minnow crash. In an attempt to disprove the board's verdict, they reenact the shipwreck themselves, only to find out that the cause appears to be Gilligan's ineptness. Later, a radio update reports that the Board of Inquiry has cleared the Skipper of the charges, as the Weather Service mistakenly read the wrong forecast that morning causing the crew to be unaware of the impending storms.

Gilligan discovers some ancient stone tablets that the Professor thinks may contain the secret of getting them off the island. That night, Gilligan dreams that he is a caveman chiseling a story on a stone tablet three million years ago.

A U.S. Air Force jetpack washes ashore in the lagoon. After close inspection of the jetpack, the Professor determines that the tanks contain just enough fuel to carry Gilligan to Hawaii. However, that determination was made before Gilligan wasted most of the fuel while proceeding to goof-up several attempts to be discovered and rescued. While flying the jetpack near where Navy search vessels are reported to be lurking, Gilligan is so scared by a radio report of an ""Unidentified Flying Object in the area"" that he blasts higher and hides in a cloud, not realizing that the UFO the Navy ships see is actually him with the jetpack!

King Killiwani and two other natives come to the island looking for a 'White Goddess.' Ginger and Mary Ann are likely candidates, until the Castaways discover that the natives plan to take the ""White Goddess"" back to their island to marry a volcano and then be sacrificed into it. After seeing Gilligan in a wig and heels, the natives choose him as the ""White Goddess.""