140 14 "Plucky Pennywhistle's Magic Menagerie"[16] Mike Rohl Andrew Dabb & Daniel Loflin February 10, 2012
Sam and Dean investigate strange happenings in a town where childhood fears are coming to life. To Sam's horror his childhood fear of clowns manifests in a very violent and traumatic way which in turn leads to Dean's childhood fear, losing his brother.
141 15 "Repo Man"[17] Thomas J. Wright Ben Edlund February 17, 2012[18]
Sam and Dean try to learn what a demon's plans are with help from a formerly possessed man in a mental ward.
142 16 "Out With the Old"[18] March 9, 2012[18]
Sam and Dean investigate when senior citizens are killing the young to regain their youth.
143 17 "The Born-Again Identity"[19] Robert Singer Sera Gamble
Castiel finally returns to help the brothers stop the Leviathans, but Dean has trouble forgiving him. Meanwhile, Sam is institutionalized for claiming to see Lucifer. This leaves Dean to deal with Castiel.
144 18 "Party on, Garth"[18]
Sam and Dean help hunter Garth on a case.
145 19 "Of Grave Importance"[18]
Sam and Dean learn of a weapon in Purgatory that can kill the Leviathans.
