|Episode(s)||7.06 Slash Fiction|
Leviathan!Dean, along with Leviathan!Sam, commits several murders in Jericho, California; Black Water Ridge, Colorado; Lake Manitoc, Wisconsin; St. Louis, Missouri; and Ankeny, Iowa; all places where the real Winchester brothers already worked cases (during the time of season 1). Their plan is to frame Dean and Sam so that, once they are arrested, they will be easy to locate and kill. He drives a '67 Impala almost identical to the one that Dean drives, except for its custom rims and Illinois license plate.
Leviathan!Dean likes impersonating the older Winchester, but only because he prefers Dean's hairstyle over Sam's. However, he doesn't agree with Dean about how good burgers really are or that Dean is funny. He turns down the other leviathan when asked to switch and impersonate Sam instead.
When he has Sam trapped in an interrogation room in Iowa, he informs him that Dean killed Amy Pond before attempting to eat him. The real Dean, however, arrives in time and decapitates him. Dean and Sam then take his and Leviathan!Sam's heads to dispose of separate of their bodies, which they leave with Sheriff Osborne. Their bodies are eventually recovered by the leviathan posing as Agent Valente.