*Updated Summary* It's the same, but it's not. Sam still loved and lost. The only difference was the "who". The dead aren't supposed to come back, but then again, Percy's always been better than most at doing what people don't want him to. Especially when it comes to the end of the world. Unfortunately, he's always been rather good at those.

Tony Stark goes missing after Civil War, a while later, the Winchesters kill a witch that had a captive. A captive named Tony, whose puzzling memories are all violent and scary. He doesn't want to go back, so he stays, and becomes a Winchester. Time passes, the Avengers realize their mistake. But does Tony want to go back, after he's finally found a true family?

In which Tony Stark is a cousin of Sam and Dean Winchester and they meet up (along with the Avengers, Pepper, and who knows who else) in between saving the world. Several times.