Invasion of the Body Snatchers

Horror sci-fi set in the fictional town of Santa Mira with the main hero of the doctor Bennellem (Kevin McCarthy - Piranha [1978]), who returned to his hometown finds that its inhabitants strangely changed. A little boy running down the street screaming that his mother is no longer true, and similarly, respond and others. Dr. Bennell soon discovers the cause: the invasion of the aliens, who through the cocoons are replaced people their soulless copies.