Mondas is a fictional planet in the British science fiction television series Doctor Who. Mondas is the homeworld of the Cybermen, a race of cyborgs. Mondas is first mentioned in the 1966 Doctor Who serial The Tenth Planet. This episode is also the first appearance of the Cybermen, a race that recurs in numerous Doctor Who stories. In The Tenth Planet, a New Zealand astronaut discovers a newly arrived planet near Earth, between the orbits of Mars and Venus. Later, a Cyberman informs the personnel of a nearby space station that this planet is the home of his people, the Mondasians. When the Cyberman mentions the planet's name, a Doctor Barclay inquires whether Mondas is not an ancient name for Earth (c.f. the Latin mundus). The Cyberman confirms, and claims that, billions of years ago, Mond