Title: Souls of the Forgotten
Fandoms: Supernatural/Torchwood/The Avengers/Doctor Who
Pairings/Characters: Tony/Sam, Jack/Ianto, Castiel/Dean, Clint/Coulson, Natasha/Pepper, Thor/Jane, Bruce/Steve, Kevin Tran, Nick Fury, Linda Tran, Kevin Tran, Benny/Darcy, the Doctor, Rory/Amy and Balthazar/Tosh
Summary: Sam watched Dean and Castiel disappear right before his eyes; with the loss of Bobby he wasn't sure how he would survive or even how to begin to find a way to rescue them. Help comes in the most unlikely fashion when SHIELD suddenly offers to try and help Sam find the mysterious Doctor. Knowing they have their own agenda, Sam is desperate and accepts their offer any way.
Meanwhile, Dean and Castiel find themselves struggling to survive in a living nightmare. For them, aid comes from a most unlikely pair of people: a fellow trapped soul, Ianto Jones and the vampire, Benny. Together the four of them must find a way to survive in their hellish prison but also find a way home.
One year later they are rescued but during that time much has changed for the brothers; is for better or worse? And how will they handle the biggest changes in their lives?
Disclaimer: I do not own Supernatural, Torchwood or the Avengers