Mondas

Mondas was the twin planet of Earth and original homeworld of the Cybermen. In ancient times, it was dislodged from its old position out into space when the Moon was formed. The Cybermen eventually learned to pilot their planet and took Mondas back to Earth, where it was destroyed.

Originally, the Mondasians resembled the humans of Earth in every respect. (TV: The Tenth Planet, AUDIO: Spare Parts) Some accounts show that in the same way that parallels to humans existed on Mondas, Lizard Kings and Sea Devils shared the planet with dinosaurs, Cybermen, (COMIC: The Dead Heart) and apes. (COMIC: The Prodigal Returns) Golgoth, a bipedal reptilian god in physical form, also lived on Mondas at this time. (COMIC: The Cybermen)

The Museum of the Last Ones had specimens of extinct species from Mondas. (PROSE: The Last Dodo)