Kratos is a character and the protagonist of Santa Monica Studio's video game series God of War, which is based on Greek mythology and Norse mythology. He first appeared in the 2005 video game God of War, which led to the development of nine more titles featuring the character as the protagonist with a 10th in development. Kratos also appears as the protagonist of two God of War comic book series and in three novels that retell the events of three of the games.