The CW has released an official description for the February 17 episode of Supernatural.
The episode is called “The Executioner’s Song.” Here’s the write-up:
THE RETURN OF CAIN — Dean (Jensen Ackles), Sam (Jared Padalecki) and Castiel (Misha Collins) deal with Cain’s (guest star Timothy Omundson) return. Crowley (Mark Sheppard) and Rowena (guest star Ruth Connell) continue to grow closer but when Crowley bails on plans with his mother to help the Winchesters, Rowena lets him have it. Phil Sgriccia directed this episode written by Robert Berens (#1014). Original airdate 2/17/2015.