The Beast of Babylon
Karkinos was the home planet of the Karkinians.
Karkinos had multiple moons and the planet LM-RVN could be seen orbiting in its sky. Ali stated that the planet was known for travellers from “everywhere” and the Ninth Doctor described it as existing within a “terminus galaxy.” Ali implied Virgo crafts were common on Karkinos.
The Ninth Doctor visited the planet whilst trying to stop a Starman. (The Beast of Babylon)