The best episode written by Robert Singer is "Appointment in Samarra", rated 8.238/10 from 21 user votes. It was "directed by Mike Rohl". "Appointment in Samarra" aired on 12/10/2010 and is rated 0.5 point(s) higher than their second highest rated, "The Trap".
Dean seeks out Death to help get Sam's soul back. Death tells Dean he will help Sam if Dean will agree to act as Death for 24 hours. Meanwhile, Sam decides he doesn't want his soul back and asks Balthazar for a protective spell to keep his soul out of his body. Balthazar tells Sam he needs the blood of his father for the spell to work and since John Winchester is dead, Sam decides Bobby is the next best thing.
Director: Mike Rohl
Writer: Robert Singer
Sam and Eileen are faced with the brutal truth. Meanwhile Dean and Cass work together in the hopes of getting a step ahead of Chuck.
Director: Robert Singer
Writer: Robert Singer
The brothers investigate the death of a man who committed suicide in a church. However, Sam is forced to team up with an unexpected ally when Dean disappears with a female demon who is interested in him personally.
Director: Charles Beeson
Writer: Robert Singer
After a ballerina is found dead from dancing herself to death, Sam and Dean look into the case and discover the ballet slippers she wore were cursed. When Dean accidentally touches the shoes the power of the curse starts to take hold of him.
Director: John F. Showalter
Writer: Robert Singer
Sam and Dean are close to collecting everything they need to open a rift into the Apocalyptic World and possibly rescuing Mary and Jack. The one missing ingredient leads the Winchesters to a black market for religious relics where everything is not always as it seems.
Director: Amanda Tapping
Writer: Robert Singer