God of War II is an action-adventure hack and slash video game and the second installment in the God of War series, the sixth chronologically, and the sequel to 2005's God of War. It is based on Greek mythology and set in ancient Greece, with vengeance as its central motif. The player character is protagonist Kratos, the new God of War who killed the former, Ares. Kratos is betrayed by Zeus, the King of the Olympian gods, who strips him of his godhood and kills him. Slowly dragged to the Underworld, he is saved by the Titan Gaia, who instructs him to find the Sisters of Fate, as they can allow him to travel back in time, avert his betrayal, and take revenge on Zeus.