Actress Danneel Ackles is set to appear on the 13th season of the CW's 'Supernatural'. Ackles is the wife of one of the show's main stars Jensen Ackles, who plays Dean Winchester. According to Variety, Danneel will portray Sister Jo, “a well-known faith healer whose good works attract the attention of Lucifer himself." The character is set to appear in episode 13 of season 13, entitled ‘Devil’s Bargain.