"Marking Kratos' second foray into portable gaming, God of War: Ghost of Sparta stands as a spin-off nestled between the events of God of War and God of War II. Despite ascending to the title of the god of war, Kratos remains haunted by nightmarish visions. One such vision compels him to embark on a new journey when he witnesses his mother, Callisto, imprisoned in Atlantis under the dominion of the sea god Poseidon. Against Athena's counsel to ignore the vision, Kratos sets forth to unravel his past and, in the process, rescue his long-lost brother, Deimos, from the clutches of the god of death, Thanatos. This second instalment for the PlayStation Portable (PSP) maintains a gameplay style akin to its predecessor, introducing a handful of new mechanics. Kratos wields his trusty Blades of Athena in this quest, now augmented with a new magic known as Thera's Bane, amplifying the potency of his attacks. The game also introduces several new magical items and a fresh secondary weapon. In addition to the captivating story mode, Ghost of Sparta offers the "Temple of Zeus," a location where players can spend orbs acquired in the Battle Arena to acquire various art and other bonuses."

The Oracle foretold that the demise of Olympus would come not from the Titans; but by a Marked Warrior, a mortal. The Olympian Gods Zeus and Ares believed this warrior to be Deimos, brother of Kratos, due to his strange birthmarks. Ares sieges a village of Sparta and interrupts the childhood training of Kratos and Deimos, with Athena on hand to watch over him, and kidnaps Deimos. Kratos attempts to stop Ares but is swept aside and scarred across his right eye by the violent Olympian. Ares prepares to kill the young Kratos for attacking him. Athena stops Ares and tells him they only came for the Marked Warrior, not to take the boy's life. Taken to the Domain of Death, Deimos is imprisoned and tortured by the God of Death, Thanatos.