Sam and Dean get trapped with a group of strangers and they become part of something no one has ever seen. The strangest part is, everyone else has their memory wiped, but not Sam and Dean.
A man is found wandering the road, his head and clothes bloody. He's disorientated and doesn't remember who he is. She takes him in and they get close until he starts having nightmares about monsters and killing people. Then one day, a sleek black car pulls up with a man claiming to be his brother.