Americans Jeff and Tommy, hunting in Scotland, stumble upon a village - Brigadoon. They soon learn that the town appears once every 100 years in order to preserve its peace and special beauty. The citizens go to bed at night and when they wake up, it's 100 years later. Tommy falls in love with a beautiful young woman, Fiona, and is torn between staying or going back to his hectic life in New York.
A mysterious hypnotist (Chester Morris) reverts his beautiful assistant (Marla English) back into the form of a prehistoric sea monster that she was in a past life.