Supernatural S08 E17 Goodbye, Stranger

"Saving people, hunting things, the family business."

Castiel reappears in Sam and Dean’s life and tells them Crowley has unleashed several demons into a small town in order to find Lucifer’s Crypt, which holds a valuable relicts. While interrogating a demon, the three discover Crowley has been torturing Meg, who knows the location of the crypt.