Torrence, 37, who was most recently seen on Fox's comedy "Weird Loners", will star as Sully and appear on the 11th season in the episode titled "Just My Imagination", because he needs Sam and Dean's (Jensen Ackles) help, reported Variety.
The episode will be directed by "Supernatural" alum Richard Speight Jr, who memorably played the angel Gabriel in various episodes between seasons two and nine.
Torrence previously appeared on ABC's "Mr Sunshine" and NBC's "Studio 60 on the Sunset Strip".
While Dean and John were off hunting, Sam often spent time alone in motels, cooking up an imaginary friend to help him pass the time.
"Supernatural" season 11 premieres on October 7.