God of War: Ghost of Sparta is a third person action-adventure video game developed by Ready at Dawn and Santa Monica Studio, and published by Sony Computer Entertainment (SCE). It was first released for the PlayStation Portable (PSP) handheld console on November 2, 2010. The game is the sixth installment in the God of War series and the fourth chronologically. Loosely based on Greek mythology, the game is set in Ancient Greece with vengeance as its central motif. The player controls the protagonist Kratos, the God of War. Kratos is haunted by the visions of his mortal past and decides to explore his origins. Journeying to the city of Atlantis, he finds his mother, Callisto, who claims his brother, Deimos, is still alive. Learning that Deimos has been imprisoned and tortured in the Domain of Death, Kratos attempts his rescue, climaxing in a confrontation with the God of Death, Thanatos, which ends in the deaths of both Deimos and Thanatos, with Kratos returning to Olympus, enraged at the gods.