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You... will not see the end of this day!
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—Kratos' Mortal Kombat (2011) Battle Cry
Kratos is the main character in Sony Computer Entertainment's God of War series, which is loosely based on Greek mythology. Kratos first appeared in God of War, which was released in March of 2005, and whose success led to the development of seven (including mobile versions) additional games featuring him as the protagonist. He appears as a guest character in the PlayStation 3 and Playstation Vita version of Mortal Kombat (2011) because Ed Boon and the Mortal Kombat team felt Kratos would "fit perfectly", this makes him the first guest character in the series. However, he isn't part of the story mode.