Okay, this is something I've wanted for a while - I want Sam and Dean to run into Marin (from The Born-Again Identity), a few years after what happened, because she would've been released (now that her brother isn't trying to kill her), and I'm pretty sure Sam wouldn't have just casually mentioned saving her life.

So I want Dean to find out what happened with Marin, and see what a difference his brother made, even in his darkest hour.