You are U.S. Marine Special Forces Agent, Dennis Riley. Your mission: to stay alive and to take out an infestation of monsters and mutants that have invaded a secret Antarctic military base. Braving the unforgiving hazards, players must run, jump, and climb their way through several realistic environments as they fight an army of unrecognizable organisms with a customizable assault rifle. Other features include: skillfully employed traps created by your enemies, detailed facial expressions and reactions, realistic real-time lighting and weather effects, and a multitude of authentic military situations supervised by Combat Magazine's weapons expert Ichiro Nagata.