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. (thetvdb.com)