Location from Invincible by Robert Kirkman
An asteroid prison run by the Viltrumite Empire — where the galaxy's most dangerous beings are locked in cells designed for people who can punch through steel.
The Viltrumite Prison is where the empire stores problems it doesn't want to kill yet — prisoners too valuable, too dangerous, or too politically complicated to simply execute. Allen the Alien, Battle Beast, and Nolan have all been held here at various points. The asteroid prison break is one of the series' major set pieces, as Coalition forces stage a raid to free key allies from Viltrumite custody.
A hollowed-out asteroid converted into a maximum-security facility. Dark, cold, and lit by harsh artificial light. Cells are designed to contain beings of enormous power — reinforced walls, suppression fields, and guards who are themselves Viltrumite warriors. The facility floats in deep space, impossibly remote.
Also known as: The Viltrumite Prison, Asteroid Prison