Commander Bark commands the prison system security forces on the icy Planet Coldfoot. He directs personnel guarding prisoners forced to labor in the planet's mines. When a prison work crew vanishes and mysterious subterranean creatures launch attacks, he coordinates the crisis response. This includes dispatching guards such as Jim and Walter to investigate the disappearances and combat the emerging threats. His command entails managing personnel and resources during the crisis caused by hostile alien entities surfacing from the mine.