The timeline in Mercenary takes place right after the original PS2 Killzone game. This time the player is not an ISA soldier. Instead, the player is a mercenary hired by Phantom Talon Corp. The ISA forces have had no choice but to hire mercenaries at this point in their struggle against the Helghast. Being mercenaries they are only contracted with ISA for money. And can and will side with whoever wishes to employ them. But the ISA forces have no choice and under the command of Phantom Talon Corp leader, Anders Benoit; they begin their missions. The protagonist is Arran Danner and under Benoit’s command goes on various missions on planet Vekta and Helghan. Since players are playing the role of a mercenary they will get a chance to play on both sides of the war during the campaign missions.