Supernatural: The Anime Series (2011)

S1E20 What Is and What Should Never Be

Dean finds himself in an alternate reality where everything has changed. His mother, Mary, is alive, he is happily married, and Sam is set to wed Jessica. However, Dean quickly uncovers the truth: he has fallen into the clutches of a Djinn, who is gradually draining his life force. As he navigates this twisted version of his life, Dean must confront the reality of his situation before it's too late.