Gilligan is bitten in the neck by a bat and fears he will transform into a vampire as a result. Gilligan's troubled sleep is haunted by a dream that he is indeed a vampire living in a European castle in 1895 where unsuspecting travelers and a famous detective and his doctor assistant appear at his doorstep. Will they be invited to stay for -or as- dinner?
While fishing in the lagoon Gilligan catches a crate filled with vegetable seeds. These seeds grow plants at a miraculous rate, but like everything good that happens on the island, there's a catch.
A down on his luck producer, Harold Hecuba, appears on the island and refuses to make contact with his offshore boat until he has something to show on Broadway. After the castaways perform a musical version of Hamlet he slips away.
Gillian loses his rabbits foot in a cave, and finds buried clay items from earlier villagers. The cave also holds a witch doctor who decides to place curses on the castaways and put them in a voodoo spell.
Plain and homely Eva Grubb escapes the scorn and rejection of civilization in a motor boat and lands on Gilligan's island, where Ginger and Mary Ann are confident a Hollywood makeover can bring out Eva's hidden beauty and restore her self-confidence.
The Maritime Board accuses the Skipper of being solely responsible for the loss of the SS Minnow, so the castaways recreate the shipwreck to discover the truth.
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.
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.