The Castaways are captured by a Japanese sailor who thinks that WWII never ended. When the other castaways are captured, it is up to Gilligan to save them.

The Castaways discover that Gilligan has been keeping a secret diary. When they read it, they all seem to disagree with how certain events unfolded and tell their side of the story.

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

A mad scientist lands on the island, and makes the castaways work for him through the use of rings that, when placed on their fingers, cause them to fall under a hypnotic trance. What are his evil plans? To use the hypnotized castaways to rob Fort Knox!