The New Adventures of Gilligan

The Same Old Dream (1x15)

Air date: Dec 14, 1974

Gilligan has a dream about a mysterious stranger who teaches him how to turn the radio into a transmitter, so the castaways can send a rescue message. Everyone gets so involved in trying to get Gilligan to remember his dream, they do not notice an actual mystetious stranger is on the island, spying on them.