Zak an aging marine on mars under the control of a super computer called Mother finds out his brother has been banished out of the colony and sent out to the desolate zone where there was no no life, no oxygen, no nothing, but there was, Zak betrays mother and goes in search of his brother and a lot of answers, mother was not just mother, his brother was not just his brother, what Zak finds out really pushes him to the limit and all hell breaks loose! with some help from his droid and more can Zak find the truth behind mother and a lot more?