Allergy Time

Allergy Time is the 28th episode of the Third Season. It aired March 31, 1964.

Synopsis
The Skipper comes down with a sneezing fit that the Professor notices only seems to occur near Gilligan. He tries to test if it could by psychosomatic or unconscious by testing the Skipper and his proximity to the other Castaways but this fails. Gilligan has no choice but to move out of the boy's hut and stay in the supply hut with the Professor who soon has sneezing fits himself. Eventually, everyone turns out to be allergic to Gilligan who leaves camp. Unable to live without his little buddy, the Skipper finally decides to take the anti-allergy shot the Professor created as well as everyone else. By the next shot, however, Gilligan realizes the papaya oil he was using on his hair was causing the sneezing fits, but the others annoyed by the shots are not in a happy mood to welcome him back just yet. In the closing shot, the Professor feels that Gilligan needs an anti-allergy shot in case the papaya oil has entered his body, but it's really a pretense to scare Gilligan with a really large bamboo needle. Gilligan is willing since the others endured so much discomfort, but balks at the size of the needle, backing up into the real needle by accident.

Trivia

 * It's never revealed how the Professor makes an anti-allergy shot without knowing what the real cause of the allergy was.
 * The tag scene with the giant needle is missing from most syndicated versions of the episode.