Castiel brought back Sam without his soul, and Dean implores the help of the Horseman Death in order to retrieve it. Death puts a wall up in Sam's mind so that he will not remember Hell. Sam's original personality is restored with no memory of the past year and a half.

After getting his soul forcefully shoved back into him, the real Sam wasn't really there either. He was a guy with this wall in his head, keeping back the trauma, the pain that defines who he is.

The main story of Call of Duty: Modern Warfare 3 lasts around five hours, according to HowLongToBeat. However, you have to be solely focused on the story or just really good to beat it in that time. If you go for some of the achievements as well, then it will take around seven hours.