AU - It’s In The Title
└ The Winchester’s discover that the Doctor is not from this world.
AU: Where Sam and Dean pose as FBI agents so they can find out what is happening to Earth, but they can’t fool Sherlock…
AU - School Reunion
└ The Doctor poses as a substitute teacher for a week at Dean’s school. They form an unlikely friendship where Dean manages to trust him enough to divulge the secrets of his life. But all of a sudden, the Doctor disappears. Years later, he finds Dean once again.