Some of the concepts teased in the game's unlockable bonus videos were used in God of War: Ghost of Sparta, such as Kratos searching out his mother, or the video about what happened to his brother. However they differ slightly in Ghost of Sparta. See more
[strides out of his ship
Ten years, Athena! I have faithfully served the gods for ten years! When will you leave me of these nightmares?
We have one final task of you, Kratos. Your greatest challenge awaits in Athens; where even now, my brother: Ares, lays siege, as we speak. Athens is on the verge of destruction. It is the will of Ares my great city fall. Zues has forbidden the gods from waging war on each other. That is why it must be you, Kratos. Only a mortal trained by a god has a chance ...