What we know about episode 20.
We have the official press release
Twigs & Twine & Tasha Banes” — (8:00-9:00 p.m. ET) (Content Rating TBD) (HDTV)

RICHARD SPEIGHT, JR. DIRECTS – 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
The official trailer
The Sneak Peek

The promotional pictures
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Albums

The twins are back. It sounds like they have been working with Mary.  I hope they don't die! We also get to meet their mother. We also have a powerful witch as part of the story. Mary finally gets  clue that the BMOL are bad news. What will she do? Odette was born during the shooting of this episode, so it may be Sam light. Tell us your thoughts in the comments or in the discussion thread for episoded 20.