Level 4 of the PS2 classic Killzone – the HD version for PS3 Strange Company.
Killzone takes place in a fictional world set in the year 2357. After nuclear war rendered much of the Earth uninhabitable in 2055, world governments formed an international order known as the United Colonial Nations. Partnering with private firms, the UCN moved to establish human colonies in Alpha Centauri, a system occupied by two planets: Vekta, a rich Earth-like world (named after the CEO of the mining conglomerate Helghan, Philip Vekta), and Helghan, a barren wasteland named after the same company. The Helghan Corporation sought to buy ownership of Vekta as well, but when the UCN imposed sanctions against its unfair business practices, a war broke out (known as the First Extrasolar War), which led to the ISA, the military arm of the UCN, driving the company out of Vekta. In response, the exiled colonists established their own civilization on Helghan, built on the principles of militarism and authoritarianism. The harsh environment and atmosphere killed many Helghans, forcing the survivors to use respirators and air tanks just to breathe. Eventually, the population, now known as the Helghast, mutated into pale-skinned hairless humanoids with increased strength, stamina, and intelligence. Violently xenophobic and convinced of their superiority, the Helghan consider humans to be beneath them, and dream of one day reconquering Vekta and expanding their empire to Earth and the neighboring star systems.
