Far in the future...an urgent distress signal is received from a classified Union Aerospace Corporation research facility based on Olduvai, Mars — and is suddenly silenced. Assigned to either contain or quarantine the mysterious threat, a crack strike team comprised of the most hard-bitten marines around believes that this will be another routine seek-and-destroy mission. But they will soon come face-to-face with the hellish nightmares that the researchers' unorthodox experiments have unleashed on Olduvai — a place where doom is waiting....