The Skipper begins to itch and sneeze whenever he is around Gilligan. Soon all of the Castaways appear to be allergic to him. The Professor develops a vaccine, but it doesn't seem to work. It turns out that everyone is allergic to the papaya oil used in Gilligan's hair tonic.
Elenco: Bob Denver , Alan Hale Jr. , Russell Johnson , Jim Backus , Natalie Schafer , Tina Louise , Dawn Wells .