Enter new protagonist Sergeant Tomas 'Sev' Sevchenko, a battle-hardened veteran of the special forces unit Alpha Team. Templar has been promoted off the battlefield and now commands the expedition. The ISA's goal is to capture Emperor Visari, and bring the Helghast war machine to a halt once and for all. Two years after the Helghast invasion is defeated, the ISA launches a massive counter assault on the Helghast's homeworld of Helghan. Returning as Jan Templar, players are sent on a covert operation to save hostages captured by Metrac, while ISA troops continue the fight for liberty. The rules of war have been cast aside with the sadistic Helghast General Armin Metrac, selected personally by Emperor Scolar Visari himself, using brutal measures in order to seize the initiative.

The invaders still control large parts of the planet, and the ISA is slowly losing ground. Two months after the events of the first game, the Helghast campaign has been dealt a hefty blow by the death of General Joseph Lente and the elimination of the traitor within the ISA's ranks, but the ground war is far from over. The player takes the role of one of four characters: Jan Templar, Shadow Marshall Luger, Rico Velasquez or Gregor Hakha, in an attempt to stop the Helghast from turning Vekta into a conquered province, as well as uncover the plot that threatens to destroy the ISA from within. Vekta's orbital Strategic Defense platforms mysteriously fail during the initial assault, allowing the Helghast to land swarms of soldiers onto the surface, and catching the now outnumbered ISA forces completely by surprise.

The first game is set in an era of space colonization where the Helghast Empire has recovered from its humiliating defeat in the First Helghan War, and launched a blitzkrieg against the outer Interplanetary Strategic Alliance (I.S.A.) colony planet Vekta. The series is known for taking classic war movie tropes and visual aesthetics from many of the 20th century's most brutal conflicts ( both World Wars, Vietnam, The Gulf War, etc) and reconstructing them, wait for it, In Space. Killzone is a series of first-person shooters exclusive to the PlayStation consoles, developed by Netherlands-based Guerrilla Games.

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