Killzone chronicles a 24th century war.
 The protagonist, Lucas Kellan, is orphaned when he and his father, Michael, are spotted with Thomas Sinclair, a Shadow Marshal, who attempts to lead them out of the side that was being taken by the Helghan forces after the "Terracide" that occurred in Killzone 3
Online competitive multi-player features up to 16 players in Killzone, 32 players in Killzone 2, 24 players in Killzone 3 and Shadow Fall, and up to 8 players in Mercenary

