Just My Imagination

S11, E8: Sam is shocked when his childhood imaginary friend, Sully (guest star Nate Torrence), makes an unexpected appearance. Sam can't understand why he'd see Sully now but what's even more surprising is that Dean can see him, too. Flashbacks reveal young Sam's friendship with Sully and why he needed him, in this episode directed by recurring Supernatural guest star Richard Speight, Jr.