Synopsis by Judd Blaise
Captain Kirk and Mr. Spock must save Lt. Sulu from a form of communal alien mind-control in this episode of the 1960s science fiction series. While undercover on a planet bearing an unusual resemblance to 20th-century Earth, Sulu falls victim to a device that brainwashes him into joining the planet's communal society. When Kirk and Spock travel to the surface, they discover that Sulu and the bulk of the planet's inhabitants are in thrall to an entity known as Landru. The Enterprise commanders band together with a small group of rebels, hoping to overthrow Landru and rescue their captured crewmate in the process.
alien [not human], brainwashing, spacecraft, space, space-exploration