Killzone is a first-person shooter, developed by Netherlands-based Guerrilla Games and released on November 2, 2004 in North America. The game was remastered in HD by Supermassive Games and re-released within the Killzone Trilogy for PlayStation 3 as well as a standalone PSN title on October 23, 2012. The game is set in an era of space colonization. Earth, after a serious nuclear war between its nations, formed a major government of the richest surviving governments and industries to explore space colonization, eventually settling in a solar system outside of Sol. Alpha Centauri is a system with two planets, the lush and blossoming Vekta, and the rich in energy supply but inhospitable; Helghan. These two planets were purchased by the Helghan Corporation after the UCN (United Colonial Nations) decided to auction them. However, after Helghast's economic policies threatened to undermine the UCN's financial system the UCN invaded Vekta and removed the Helghast after failing to impose financial sanctions. This forced the Helghast to colonize Helghan, a harsh and brutal planet, and deeply resenting the loss of Vekta. The planet's harsh environment forced the Helghast to adapt and mutate so much that they can no longer be considered human. They are stronger, faster and more resilient than their human cousins, and possess a burning hatred for humanity. Except for a small number of half-breed Helghast and trained troopers, they require a gas mask and air processing tank. |--| The Helghast Empire has recovered from its defeat in the First Extrasolar War and launched a blitzkrieg against the outer Interplanetary Strategic Alliance (ISA) colony planet Vekta. The player takes control of ISA Captain Jan Templar, who is trying to repel the invasion..