Killzone — near future. Humanity is entering the vastness of space. The era of planetary colonization is coming. There are units of the Earth Army in every star system colonized by earthlings. But behind the facade of galactic globalization, discontent is gradually brewing. In 2357, a peaceful colony of earthlings on the planet Vecta is attacked by the army of the harsh planet Helghan, led by the tyrant Scolar Visari. The Helghast want to cleanse Vekta of outsiders.
What follows is a bloody blitzkrieg: the Helghast almost manage to take over the planet, but the Vektans fight back, although they suffer heavy losses. Their supreme authority — the Council — decides that Visari must be deprived of power, otherwise the galactic colonies will not see peace. The operation has been in preparation for two years, and finally, the Vektans carry out an armed invasion of Helghan to decapitate the military dictatorship, arresting Scolar Visari.