Majus Seventeen is a paradise like tourist destination for intergalactic travelers. Guests are encouraged to go back to nature and live a simple life in wooden guest huts amidst the planets wildlife. However, when The Stranger (Colin Baker)and Miss Brown (Nicola Bryant) arrive they soon discover all is not as it is advertised in the tourist literature. They find that the planet's wildlife is far from friendly, discover decaying bodies rising out of the ground in the woods and bathing tourists have been swallowed by an angry sea. Their investigation is hindered when they encounter a mysterious woman (Sophie Aldred) who is obsessed with The Stranger.