Invasion of the Body Snatchers (1978) plot summary
In a small town near San Fransisco, Matthew Bennell (Sutherland) 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. But who can he trust to help him and who has already been snatched?