The Librarians is an American fantasy adventure television series developed by John Rogers that premiered on TNT on December 7, 2014.

The Librarians are an ancient organization dedicated to protecting an innocent world from a magical and fantasy-like secret reality hidden from view.

The series follows four people newly recruited by The Library: Colonel Eve Baird (Rebecca Romijn), of the NATO Anti-Terrorist Unit, destined to be the new Guardian; Ezekiel Jones (John Harlan Kim), a consummate thief who can hack an NSA computer as easily as he can steal a Fabergé egg; Cassandra Cillian (Lindy Booth), a brilliant scientist and mathematician who possesses a trace of magic; and Jacob Stone (Christian Kane), polymath, linguist, expert in architecture, art, art history, archaeology and world cultures of the past and present, including Native American cultures, and other fields too numerous to mention, including bar fighting.

The latter three received invitations from the Library at the same time as the current Librarian, Flynn Carsen (Noah Wyle), but for various reasons didn't show up for their interviews.

With the help of Jenkins/Galahad (John Larroquette), immortal manager of the Library’s Annex, they solve impossible mysteries, rewrite and fix key moments in history, recover powerful magical artifacts, fight against supernatural threats, and learn important things about themselves and each other.

[2] Carsen, who spends the first season searching for the main Library (removed from time and space at the beginning of the series) appears in some episodes.

The second season offers up a pair of new villains, both from fiction: Prospero (Richard Cox), from Shakespeare's The Tempest, and Moriarty (David S. Lee), Sherlock Holmes' chief nemesis.

Defeated centuries before by the first Librarian, Judson (Bob Newhart), and his Guardian, Charlene (Jane Curtin), he is resurrected when his sarcophagus is opened and embarks on a mission to release pure evil into the world, possessing many different people along the way.

While they are trying to stop Apep, the Librarians' actions are closely monitored by General Cynthia Rockwell (Vanessa Williams) from a new secret government agency, called DOSA (Department of Statistical Anomalies).

The second storyline involves the return of Nicole Noone, Flynn's first Guardian; believed dead and now immortal, her presence raises many questions.

[6][7] TNT ordered a ten-episode weekly series version of The Librarians, following the original cast that includes Noah Wyle, Bob Newhart, and Jane Curtin, as well as five new characters who work for The Library.