Abaddon blackmails Crowley and the boys interrogate one of Metatron's angels in Supernatural Season 9 Episode 21, "King of the Damned," airing May 6. The CW has released the official spoiler guide.
ABADDON BLACKMAILS CROWLEY
Castiel (Misha Collins) captures one of Metatron’s angels (guest star Gordon Woolvet) and asks Sam (Jared Padalecki) and Dean (Jensen Ackles) for help with the interrogation. Dean eagerly accepts, which doesn’t go unnoticed by Sam Meanwhile, Abaddon (guest star Alaina Huffman) demands Crowley (Mark Sheppard) help her kill Sam (Jared Padalecki) and Dean (Jensen Ackles). When he refuses, she reveals her shocking bargaining chip. Also, Castiel (Misha Collins) sets a meeting with Gadreel (guest star Tahmoh Penikett).