Don Siegel

A brief fling between a male disc jockey and an obsessed female fan takes a frightening, and perhaps even deadly turn when another woman enters the picture.

Matthew Bennell notices that several of his friends are complaining that their close relatives are in some way different. When questioned later they themselves seem changed, as they deny everything or make lame excuses. As the invaders increase in number they become more open and Bennell, who has by now witnessed an attempted 'replacement', realises that he and his friends must escape or suffer the same fate.