A native family from another island comes seeking a husband for their lovely, large, robust daughter.

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.

Gilligan bumps his head and suddenly sees everything upside down. The Professor tries to help by brewing an antidote made of keptibora berry extract, but the antidote causes Gilligan to see double. After consuming more juice, he sees four of everything. Meanwhile, the island is invaded by three headhunters who slowly capture all of the other castaways. Gilligan saves the day by serving the headhunters lots and lots of keptibora berry extract, which causes them to see ""hundreds"" of castaways running toward them!