In Killzone® 2, you assume the role of Sev, a battle-hardened veteran and a member of the special forces unit known as the Legion.

In and out within a month, they said. Their weapons no match for our military might. Predicted moderate to low resistance. Enemy morale at an all-time low. They couldn't have been more wrong. Welcome to Helghan. Two years after the Helghast assault on Vekta, the ISA are taking the fight to Helghan. Their goal: to capture the Helghast leader, Emperor Visari, and bring the Helghast war machine to a halt.

For Sev and his squad, the invasion of Helghan is just beginning. Tasked with securing Pyrrhus, the Capital City, they quickly discover that the Helghast are a formidable enemy on their home planet. Not only have they adjusted to the planet's hostile conditions, they have also harnessed a source of power they can now use against the ISA. Sev and his squad aren't just fighting the enemy forces — their fiercest opponent is the planet itself.