The Outer Limits

A loner in enemy territory, secret government agent Spain (Don Gordon) infiltrates the ranks of the Invisibles -- a subversive, underground society of the nation's power brokers who are possessed by alien parasites. Pushed to the razor's edge of endurance, Spain fights a brutal, suspense-laden battle against the spread of the alien infection. Considered one of the series' most unnerving episodes. Tony Mordente, George MacReady, Neil Hamilton and Richard Dawson also star.