'The Librarians' will open its doors to two fan favorites for season 3! Someone in The Librarians casting department is killing it at their job.

Which new nefarious character will threaten the Library? Find out now! Last season, The Librarians battled the Knights of the Round Table. This winter, the genius protectors will go up against one of the Bard's more tempestuous creations.

From digging benieth the 'Stones' to 'Happily Ever Afters,' get a sneak peek at season 2

Jake Stone will go up against a familiar looking face in season 2 Double the Kane, double the trouble for The Librarians. 'The Librarians' Season 2: Three Guest Stars Announced; Check Out Their BTS PHOTOS From Set! The first promo for The Librarians' hit the air on Sunday night (see video below), and a particularly amusing fight scene has fans buzzing.