“The Prisoner” is the name of the May 13 episode of Supernatural, and the description that The CW released to promote the episode is pretty short, surely to keep fans from getting too spoiled.
What we do know is that the episode is called “The Prisoner” and below, you can find that very short write-up.
DEAN IS ON A RAMPAGE — When it comes to the Stynes, Dean (Jensen Ackles) decides to take matters into his own hands. Sam (Jared Padalecki) tries to come to terms with his decision. Thomas J. Wright directed this episode written by Andrew Dabb (#1021). Original airdate 5/13/2015.