According to some reports, it was the name of the planet which, in the years 2972 AD, was coveted by both Ashe's colonists and Captain Dent from the Interplanetary Mining Corporation, who wanted its duralinium resources. It was also inhabited by primitives and non-humanoid priests, all of whom worshipped the Guardian of the Doomsday Machine, the sole survivor of the super-beings who had once occupied Exarius. The Doomsday Machine (which was responsible for the poisoning of the colonists' crops) was coveted by the Master, but was eventually destroyed the Guardian. Thanks to the intervention of the Third Doctor and Jo Grant, the colonists defeated Dent's evil schemes and kept their planet (HHH).