Abaddon coup d'état is continuing to move forward on Supernatural, but the Knight of Hell will soon be pairing with her political rival in order to take down her most formidable foes - the Winchester brothers.

Just in case Crowley's (Mark Sheppard) current path of self-destruction isn't enough to herald his monarchical downfall, Abaddon (Alaina Huffman) has unearthed some form of leverage she can hold against the reigning King of Hell. Felled by the clever blackmail plot, Crowley will lure Moose and Squirrel into a trap of Abaddon's making during "King of the Damned, but he won't leave them completely defenseless.

The First Blade will be back in play when Sam (Jared Padalecki) and Dean (Jensen Ackles) enter a showdown with their ginger opponent, but the murderous bone won't be the only piece of Supernatural history making a reappearance.

Someone is returning and, while the actor's identity still remains a mystery, they could have a part to play in Abaddon's latest scheme.

"Exciting stuff N this episode! Minor, obscure character returns," tweeted S. E. Hinton, Supernatural fan and author of The Outsiders, while visiting the Vancouver set in March. "No, not Gab[riel], Bobby, or Balthazar. MINOR. Very surprised Major Happening."

Could Crowley's son pop up once more? The demon's estranged son once helped the Winchester's in a failed attempt to destroy Crowley, could Abaddon do the same? Tell us what you think in the poll below!

Supernatural airs Tuesdays at 9 p.m. ET on The CW. Click the video below to see a preview of the series' next episode, "King of the Damned."

Tags: supernatural the cw television