If so it will be ep 19 that is the one that Nina Lopez Corrado directed:
ANGELS, WITCHES AND REAPERS, OH MY – Sam (Jared Padalecki) and Dean (Jensen Ackles) must stop Rowena (guest star Ruth Connell), who is on a deadly mission. Meanwhile, Castiel (Misha Collins) looks to heaven to recruit angels for an impending invasion but is shocked by not only what he finds, but who.