Supernatural: What is and What Should Never Be

Dean hunts something called a Djinn -- basically, a genie -- and winds up being transported to a parallel universe where Sam is in law school, engaged to his deceased ex-girlfriend, and their mother is alive. While this appears to be a perfect world for Dean, he soon learns that every potential victim he has ever rescued is dead in this parallel universe and now he must decide if he should be selfish or continue to save others from the ghosts and the monsters.