When the Second Doctor, Polly, Ben and Jamie visit a human colony that appears to be one big holiday camp, they think they have come across a truly happy place. Yet a shadowy presence soon makes them realise that the surface contentment is carefully controlled.

Cast:Patrick Troughton, Anneke Wills, Michael Craze, Frazer Hines, Peter Jeffrey, Graham Armitage,

Genre:Drama, Adventure, Science Fiction,

country:United Kingdom,

Production:BBC,