 However, AJ3905's hellish atmosphere consists of a poisonous, caustic gas that promises an agonising death for unprotected humans which requires the wearing of a protective suit (known as a 'Tophat').Furthermore, it is occupied by a hostile life form that appear as frighteningly skeletal anthropomorphic forms through the Tophat's virtual reality display.It is the role of Griffin and his fellow army recruits to protect the scientific mining crew during their repeated forays to the planet.