The Outer Limits - Season 2 Episode 16 The Deprogrammers

With Earth under alien rule and millions dead, the human race has been programmed to slavery. A small band of rebels kidnaps Evan, alien leader Koltok's personal slave. Trent Davis, leader of the rebels, tries to return Evan to his former self through arduous deprogramming sessions. To aid in the process, Evan is reintroduced to his wife Jill. As his sessions progress, Evan learns of the death of his daughter. He agrees to join the rebels and assassinate his former master - with devastating results.