Arcturus VIII was the home planet of the Cardianon race and the eighth planet of the Arcturus System, but it was destroyed after an attempt at complete mechanization by the Cardianon, thanks to the Epiphanies of Guidance.

It was replaced by the Cardianon Mothership, an enormous space fortress constructed in place of the original planet. The planet was inhabited by the reptile Cardianon, but the influence of the Epiphanies of Guidance caused this race to evolve and create an overdeveloped civilization.