Mogar

Mogar was a planet in the Perseus arm of the Mutter's Spiral galaxy. It had no oxygen in its atmosphere and was rich in rare minerals, including vionesium. Mogar was also the home planet of the Mogarians, as well as the Vervoids who were developed there. When Mogar was discovered by humanity circa 2986, it was taken over for its mineral wealth. (TV: Terror of the Vervoids) The Earth Empire later terraformed it, (PROSE: Christmas on a Rational Planet) though another account claimed that Earth colonised Mogar in 4043. (COMIC: Station Zero)

The Sixth Doctor claimed to have visited the planet. (TV: Terror of the Vervoids)