Other names: Terra Nova/Possibly Marinus
Type: Earth's twin planet
Location: Originally Sol system; drifted towards the edge of space.
Affiliation: Mondasians/Cyber-race
Universe: Doctor Who

Mondas was the twin planet of Earth and was the home planet of the Mondasians. As they found their race to be dying, they transformed themselves into Cybermen. Mondas appeared as an upside-down version of Earth from space. The planet was destroyed in 1986.(Doctor Who: The Tenth Planet)

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