Supernatural: Goodbye Stranger

Castiel returns to help the Winchesters when they become involved with Crowley's hunt for Lucifer's Crypt. The trio soon finds the source of Crowley's information: Meg, tortured for her knowledge of the Crypt's location. As they race to find the Crypt before Crowley, the Winchesters soon realize that Castiel is hiding important information from them.