A Russian agent who looks and dresses exactly like Gilligan holds Gilligan captive and questions the castaways about their activities. However, nobody believes Gilligan's story and they accuse him of causing all the mischief.
A Hollywood producer lands on the island and is unimpressed with Ginger's acting abilities, so the castaways put on their own production of "Hamlet" to get the producer's attention.
A witch doctor wreaks havoc on the castaways after he steals a personal item from each of them and then creates voodoo dolls that bear their likenesses.
Mr. Howell names the other castaways as beneficiaries in his will. But he then fears they may be trying to kill him for their inheritance, when in reality they are throwing a surprise party for him.
A famed butterfly collector comes to the island in search of the rare "Pussycat Swallowtail," and the castaways try to help him find it so he will shoot his flare gun and rescue them.
Gilligan believes he has become an old man after his hair turns completely white overnight, but The Professor's solution only makes things worse when his hair completely falls out.
Mad scientist Boris Balinkoff returns to the island with a new invention that turns the castaways into "human robots," whom he plans to use to commit the ultimate crime.
While the castaways prepare for a possible attack from headhunters, Gilligan hits his head on a tree and begins seeing things upside down. The Professor prepares a cure for him, but it only makes him see double instead.
Gilligan and The Skipper find a government briefcase with top-secret information in the lagoon, and when Gilligan handcuffs himself to the briefcase, he becomes afraid that the enemy will come to the island and kill him.
A smooth-talking criminal comes to the island and holds the women on the island hostage in exchange for ransom money, but when he is captured they decide to try and reform him instead of holding him prisoner.
The castaways start disappearing one by one, and when the remaining castaways discover that headhunters have not taken them, Gilligan begins to think he's a "Dr. Jeckyll and Mr. Hyde" and has killed them all.
An unattractive and lovelorn woman named Eva Grubb comes to the island to escape civilization and offers the castaways her boat. But before they can leave, the women give her a makeover and turn her into a Ginger Grant lookalike.
The Skipper is named "sheriff" of the island, with Gilligan as his deputy. But when The Skipper is away helping The Professor, Gilligan becomes drunk with power and throws everyone in jail.
A game show contestant comes to the island and can win $10,000 if he can survive one week without outside assistance, so he refuses to let the castaways use his transmitter because he would have to forfeit the prize.
The Professor recreates the Minnow voyage to disprove a Maritime Board charge that The Skipper was responsible for the wreck of the Minnow, but their efforts prove that the person to blame for the wreck is actually Gilligan.
A big-game hunter arrives on the island. Upon learning there is nothing on the island to hunt, he chooses instead to hunt one of the castaways--and he chooses Gilligan.
Mr. Howell becomes outraged and jealous when he discovers that a secret admirer is sending letters to Mrs. Howell. But everyone is even more shocked when they discover that he's the one who's sending them.
Gilligan's body conducts electricity after he is struck by lightning with a bowling ball in his hand. But when The Professor tries to remove the bowling ball from Gilligan's hand, a second lightning strike makes him invisible.
The castaways try to contact two astronauts in a space capsule orbiting over the island, but they fail. However, they may get a second chance when an unmanned capsule they are trying to make contact with lands on the island.
The castaways find a headhunter tribe's totem pole on the island. The head on the top of it bears an uncanny resemblance to Gilligan--which comes in handy when the headhunters return to the island.
After Mary Ann watches Ginger perform on the island she hits her head giving her amnesia thus believing that she is Ginger Grant. Everyone plays along, until Mary Ann can't act or dance and her memory comes back.
Gilligan rescues a native woman from drowning, which according her custom makes her his slave. But soon a fellow tribesman comes to the island and challenges Gilligan for her in a fight to the death.
The castaways attach a message to a homing pigeon that has flown off course and landed on the island, but the man who receives their message thinks it's part of a practical joke.
A lost crate containing a top-secret clay that can be converted to explosives washes up on the island. Not knowing what it is, they make several items with it--including Gilligan's new tooth fillings.
A king from a nearby island comes to the island in search of a "White Goddess" to sacrifice to a volcano, but the castaways offer Gilligan to him instead to protect the women.
