The Puppet Masters

In rural Iowa, a flying saucer crash sets off a chain of events as government agents Andrew Nivens (Donald Sutherland), Sam Nivens (Eric Thal), and Dr. Mary Sefton investigate the site. They soon discover that the aliens, resembling slug-like creatures, are controlling the minds of local residents, spreading their dominion. As the team tries to stop the invasion, they must also contend with their own agents being infected, leading to a desperate bid to save humanity from the alien parasites.