A popular American singing group, the Mosquitoes (Bingo, Bango, Bongo, and Irving), land on the island hoping for some quiet and relaxation on a deserted island.

A mad scientist lands on the island and takes the Castaways to his castle . . . on a nearby island . . . to perform experiments on them.

Gilligan discovers an island bush that produces seeds which, when eaten, give a person the ability to read the minds of others. This leads to disaster when everyone insults each other through their honesty and thoughts.

Gilligan's mouth becomes a radio after he is accidentally hit on the head. When their regular radio is broken, Gilligan becomes their sole source of information on the approaching typhoon.

A crate containing coconuts is wrapped in an old Honolulu newspaper that read that one of the Castaways are being sought in a murder investigation. The castaways become suspicious of each other and decide to recreate the events of the night before they sailed, in order to solve the Randolph Blake murder case.

A ghost appears on the island and tries to scare the Castaways off. The castaways turn the tables by dressing in sheets and roaming around the island to scare the visitors off the island.

A huge meteor lands on the island, causing everything nearby to age very rapidly. The Professor determines the rapid aging is being caused by strong cosmic rays (he makes this determination by using his bamboo Geiger counter!).

A NASA satellite with a TV camera, accidentally lands on the island instead of the intended target: Mars. The castaways try to communicate their S.O.S. when the camera is operational. However, with the help of a Gilligan goof-up, the castaways are covered with glue and feathers, and the NASA scientists mistakenly believe they are seeing the first proof of life on Mars.

The Professor thinks that the island is sinking, which causes the Castaways to panic. As it turns out, Gilligan has mistakenly moved the Professor's measuring stick, so the panic was a false alarm.

The Castaways make a silent movie in the hopes that it will be discovered by someone who will rescue them.

Hot water spurting from beneath the island pleases the castaways as they can now have hot water piped to their huts. However, the hot water also concerns the professor since it means that increased volcanic activity may be imminent. The Professor saves the day by making a bomb from ingredients found on the island (of course!) to spike the volcano.

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 storm washes up a Trans-continental telephone cable up into the lagoon. Once again the Castaways are given hope for a rescue, as the Professor manages to break into the cable and rig up a telephone so they can dial out for help.

The Professor determines that the lack of vitamin C on the island threatens the health of the castaways. While watching the last of their orange seeds to protect them from the cold night air, Gilligan falls asleep and dreams that he is Jack from ""Jack in the Beanstalk.""

Gilligan suggests a beauty contest to decide which of the three women will become "Ms. Castaway." Mr. Howell attempts to sabotage the other contestants by spreading glue on the stage before Mary Ann's big dance scene, and by shooting spit-wads at Ginger while she performs. The Professor blows pepper at the stage when it is Mrs. Howell's turn. Then, when all the competitions are complete, the final decision rests with the judge.....Gilligan!

Gilligan has the winning ticket for a South American sweepstakes.

Two Russian Cosmonauts land on the island in their space capsule. Since the cosmonauts keep a tight guard on the space capsule, the castaways must come up with a way to smuggle one of them into the capsule in order to send back help after the cosmonauts are rescued.

The Castaways hear on the radio that Mary Ann's boyfriend in Kansas is getting married. Mary Ann overhears the others talking about her, and mistakenly believes that she has been poisoned by the mushrooms she recently ate, and has only a short while left to live. A hilarious dream sequence follows, featuring the Professor sounding a lot like Cary Grant.

The Skipper begins to itch and sneeze whenever he is around Gilligan. Soon all of the Castaways appear to be allergic to him. The Professor develops a vaccine, but it doesn't seem to work. It turns out that everyone is allergic to the papaya oil used in Gilligan's hair tonic.

Gilligan and the Skipper hear a radio broadcast telling of the collapse of the Howell financial empire. The castaways attempt to help them develop skills in order to compete in the working world.

The Skipper worries that something is going to happen to him, so he begins to train Gilligan to be a leader. The Skipper then disappears leaving Gilligan in charge, with predictable results!

While fishing, Gilligan pulls a WWII mine out of the lagoon. When the Professor is unable to deactivate the mine, Gilligan tows it back into the lagoon, where it harmlessly explodes.

The Howells plan a party, and Mr. Howell accidentally loses the Skipper's invitation. The others refuse to attend, believing that the Howells have intentionally snubbed the Skipper.

An experimental robot launched by the Air Force parachutes onto the island. The professor reprograms the robot to walk to Hawaii ("one hundred eleven hours"), but the "lucky" rabbit's foot that Gilligan secretly stuffed into the robot causes it to malfunction upon arrival in Hawaii.

The radio reports that Mr. Howell has been rescued and is spending all of his money. Obviously, there is an imposter! The real Mr. Howell is frantic, and offers a reward to the person who can come up with a plan to get him back to civilization. Meanwhile, the imposter falls off a luxury liner and ends up stranded on (you guessed it!) Gilligan's Island. There the imposter conks Mr. Howell on the head with a coconut, changes clothes with him, and attempts to continue his masquerade as the millionaire.