Kratos vs. the Warhammer 40,000 Space marines.
Points in favor of Kratos: can kill gods, has crazy firesword-chain things, is impossibly strong for his size, can reform himself (don't say he can't, watch the beginnig of God of War II)
Points in favor of the space marines: There are a hell of alot of them, they are also impossibly strong... that is all I can think of that would actually factor into the fight.