Tony Haygarth stars as a repair man who life is radically changed when he meets the beautiful Miss Griffin (Prunella Gee), from the planet Mercury… Sci-fi comedy drama from acclaimed Quatermass writer Nigel Kneale.  In the small town of Bingleton there is an electrical repair shop, run by Des Kinvig. 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 is a lifelong UFO watcher and becomes consumed by jealousy when he discovers that Kinvig has actually become involved with aliens.