Filmed in late 1967, this episode wasn't seen on British television until January 15, 1969, and even then it was beaten by its American TV premiere on March 27, 1968. The plot is motivated by an unusual school, designed to train civilian astronauts. When one of the "students" is found murdered, Steed and Tara enroll in the school, only to find themselves in the vanguard of a widespread extraterrestrial invasion. "Distinguished" by some of the worst special effects in the history of television, "Invasion of the Earthmen" at least benefits from a clever script by Terry Nation. ~ Hal Erickson, Rovi