Over at Shocktilyoudrop.com, they have posted some pictures of the Supernatural episode that will be airing on April 29th, along with a synopsis of the episode, titled "The Devil You Know"
From shocktilyoudrop:
"The demon Crowley (guest star Mark Sheppard) tells Sam (Jared Padalecki) and Dean (Jensen Ackles) he can help them find the remaining Horsemen rings so they can trap Lucifer. The brothers are doubtful until Crowley leads them to Brady (guest star Eric Johnson), the Handler for Pestilence (guest star Matt Frewer) and Death. However, Brady refuses to give up their locations and sets Pestilence after the Winchesters."
Here are few of the photos. Click the link below for more!'