Space Siege takes place in the confines of the Armstrong, one of the few remaining colonization ships carrying the last bastions of human civilization after a devastating attack on Earth from an unknown alien race. Players will take the role of Seth Walker, a cybernetics engineer suddenly thrust into a struggle to save humanity from extermination. As the adventure progresses Seth is offered opportunities to sacrifice pieces of his humanity for cybernetic upgrades that will assist him in his mission to preserve the human race. But what price will he pay to save his own humanity? Only the player can decide Seth’s ultimate fate.

Space Siege features a dynamic storyline based upon the decisions the player makes throughout the course of the game. Based upon the cybernetic modifications the player chooses to make on Seth’s body, NPC’s will react and interact with the player differently and, ultimately, different story resolutions will be reached.