The Blazing Eyes are monstrous creatures that inhabit the catacombs and dungeons beneath the abandoned Martian cities. No detailed description is ever given of them other than that they are about the size of a human and they never blink or make any sound. They seem incapable of tolerating light, and though they will pounce upon anyone who is weak or dead, they will retreat from anyone who attacks them. John Carter encountered these terrible beasts twice - first during his incarceration at the hands of the Warhoons, and years later, during his quest to rescue Tars Tarkas from the Warhoons. These monsters have only been sighted beneath the cities controlled by the Warhoons.