On this episode of Supernatural…
Sam and Dean try and track down Rowena as Castiel seems to get worse.
Rowena is trying to recruit witches for her Mega Coven.
Sam and Dean capture Rowena.
Dean learns that Sam made a deal with Rowena.
Castiel goes missing.
Dean tries to stop Castiel from hurting someone, but the spell is too powerful.
Rowena gets rid of the spell, but she manages to flee.
Crowley is parenting the Darkness and giving her plenty of studies and souls.
By the end, she has become a teenager.