Des Kinvig (Tony Haygarth) runs an electrical repair shop in the small town of Bingleton. One day his store is visited by Miss Griffin (Prunella Gee), who is from the planet Mercury and in need of Des' help. Kinvig's friend Jim Piper (Colin Jeavons) is a lifelong UFO watcher and is consumed by jealousy when he discovers that Kinvig has actually become involved with aliens.
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