Years after a lone Marine successfully repelled Hell's assault on Earth, the Union Aerospace Corporation's contaminated research facilities remain sealed behind a quarantine barrier. When a mysterious satellite transmission indicates that something monstrous has endured the radiation and begun marshaling demonic forces anew, resurrecting corpses into twisted abominations, the only warrior with proven experience against the infernal grows dispatched into the irradiated installations. Descending alone into the heart of the compromised stations and the hellish dimensions beyond, the Marine must confront both the rekindled demonic army and the powerful entity orchestrating their resurrection.