Sam and Dean seek Castiel's help when they investigate a case of police officers who seem to have been killed by Egyptian plagues.
Weekend at Bobby's
S6 E4
Bobby asks Dean and Sam for help after Crowley refuses to return Bobby's soul; a deep secret about Crowley is revealed.
Live Free or Twi-hard
S6 E5
After young girls go missing, Dean and Sam realize vampires have come to town; Dean is bitten during a fight with two vampires.
You Can't Handle the Truth
S6 E6
Sam and Dean investigate a rash of suicides and discover that someone is invoking the Goddess of Truth to drive the victims crazy.
Clap Your Hands If You Believe
S6 E9
Dean is abducted from a crop circle while investigating a UFO sighting; when he awakens, Dean discovers that he is dealing with fairies; Sam's investigation leads him to a world filled with elves, gnomes and a leprechaun.
Caged Heat
S6 E10
Meg kidnaps Dean and Sam and tries to make them reveal Crowley's location; Sam tries to find out how to get his soul back.
Appointment in Samarra
S6 E11
Dean contacts Death in hopes of getting Sam's soul back; Sam asks Balthazar for a protective spell.
Mommy Dearest
S6 E19
Dean, Sam, Castiel and Bobby find Eve in a small town where the citizens have been converted to demons; Eve decides to torture Sam and Dean by bringing their mother back as a demon.
The Man Who Would Be King
S6 E20
Castiel talks about the war in heaven and what happened to set Raphael against him; Bobby suspects Castiel isn't being completely honest.