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 finds a crate of radioactive vegetable seeds. The plants grow quickly and grossly misshapen, but the Castaways are so hungry for new items in their diet that they consume them quickly. The plants, when eaten, give the castaways super-human powers. Of course, after he realizes that the vegetables are radioactive, the Professor saves the day by making a homemade soup to absorb the radioactivity.

Famous Hollywood director Herald Hecuba lands on the island during his world-wide talent search. The castaways put on a musical version of Hamlet in order to impress the director, with hopes that he will take them back to Hollywood when he leaves.

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 is bitten by a bat, and then dreams that he has turned into a vampire. Fortunately the Professor knows about bats (what DOESN'T he know about?!), and is able to identify the bat that bit Gilligan as a common red fruit bat, rather than a vampire bat.

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.

One by one, all of the Castaways mysteriously disappear. Gilligan then dreams that he is Dr. Jekyll and Mr. Hyde. In the end, Gilligan rescues them from the hidden World War II munitions pit that they have all fallen into.

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.

While fishing, Gilligan and the Skipper reel in a briefcase, stamped with the words ""Property of the U.S. Government."" Everyone believes that the case contains top secret government material. Gilligan accidentally handcuffs the briefcase to his wrist, and has a wild dream about secret agents, evil enemy spies, and deadly spy games!

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 witch doctor makes voodoo dolls from the Castaways' personal objects, which he has stolen from their huts. Gilligan stumbles upon the hidden voodoo dolls and brings them back to the Castaways. He then fashions a voodoo doll in the likeness of the witch doctor, to fight fire with fire! Even though the Professor was turned into a motionless zombie for a short time, he refuses to acknowledge a scientific acceptance of voodoo.

Mr. Howell revises his will, and leaves a large chunk of his estate to each castaway. They decide to throw him a party to show their appreciation, but when he overhears them talking about which one of them is going to have to ""cut the pigs throat"" he thinks they are planning to kill him in order to collect their inheritance. Later, he discovers that they have actually trapped a wild boar in an effort to serve him bar-b-que spareribs as a surprise.

Mary Ann falls backwards while watching Ginger perform on stage, and, when she awakens, she thinks that she is Ginger. Meanwhile, Gilligan accidentally watches as the Professor attempts to hypnotize Mary Ann, and thus he begins to think that he is Mary Ann.

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.""

A crate that washes ashore contains a top secret plastic explosive developed by the US Government. The Castaways make use of the plastic in a variety of objects, including nails for the Skipper, dishes for Mary Ann, jewelry for Ginger, golf balls for Mr. Howell, and even fillings for Gilligan's teeth, unaware that once hardened it becomes a dangerous explosive which will detonate on impact!

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!

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.