Invasion of the Body Snatchers (1956)

One of the greatest and most influential Sci-Fi films of all time stars Kevin McCarthy as a doctor in a small California town whose patients are becoming hysterical and accuse their loved ones as emotionless imposters. Plant-like extra-terrestrials have invaded Earth, replicating the villagers in giant seed "pods" and taking position of their souls while they sleep. Realizing that the epidemic is out of control, in a terrifying race for his life, he escapes to warn the world of the deadly invasion of the pod people! Directed by the great Don Siegel (Dirty Harry) and co-starring Dana Wynter, Carolyn Jones, Larry Gates and King Donovan. Remade in 1978, 1997 and 2007.