Supernatural 12×20 “Twigs & Twine & Tasha Banes” Season 12 Episode 20 Promo – Alicia Banes (guest star Kara Royster) calls Mary (guest star Samantha Smith) for help after her mother, Tasha (guest star Alvina August), goes missing. Sam (Jared Padalecki) answers Mary’s phone and he and Dean (Jensen Ackles) head out to help Alicia and her twin brother, Max (guest star Kendrick Sampson), find their mother who was hunting a powerful witch. Meanwhile, Mary starts to have some doubts about the British Men of Letters. Richard Speight, Jr. directed the episode written by Steve Yockey (#1220). Original airdate 5/4/2017.