Killzone Shadow Fall is a science fiction first-person shooter video game developed by Guerrilla Games and published by Sony Computer Entertainment. It is the sixth game to be released for the Killzone series and the fourth game in the series to be developed for home consoles. Taking place 30 years after the events of Killzone 3, Shadow Fall follows a new set of characters, putting players in the role of Lucas Kellen, a "Shadow Marshal", who is investigating a rising threat in the continuing war between Vekta and the Helghast. Along the way, Kellen encounters Echo, a Helghast operative who seeks to end the war. Kellen's world will be changed forever through his encounters with Echo and other characters, as he searches for the truth in a mission where the line between good and evil is blurred beyond recognition, and where the peace he sacrificed so much for may not even exist.