(Takes place between Killzone: Liberation and Killzone 2)
Though the ISA won a strategic victory with the SD platform destroyed, the war for Vekta is still going on strong with the Helghast and ISA fighting a brutal battle for control of the planet. An ISA detachment sent to secure sensitive data from a military R&D facility got ambushed by the Helghast waiting for them there. There was only one survivor.
Corporal Adrian Freeman was the only survivor of the ambush, trapped with rescue not being possible for 24 hours. To further add to his dilemma, He, by sheer luck, killed the commander of the Helghast battalion in the chaos of the ambush, painting a bigger target on him as he made off with Helghan Military intel relating to defense. With luck and numbers not on his side, Adrian must survive until a platoon can extract him and bring him home. Being his first combat experience, the next 24 hours for him would be a test of both his mind, body, and will to survive against hopeless odds.