Great Britain

What frightening thing is happening to change the inhabitants of Balfe, an island off the west coast of Britain? Someone or something is threating their very existence and nothing and no one is safe. Dr Shaw (Ian Bannen) is a scientist from Doomwatch who tries to save the pitiable, frenzied monsters these people are becoming. Victoria Brown (Judy Geeson) the local teacher misguidedly shields these islanders from the inquisitive stranger. Someone, it seems, is tampering with nature and time is running out. What is happening to them today could happen to us tomorrow - what IS happening?