This fantasy series features an ancient organization dedicated to protecting the world from a secret, magical reality. Flynn Carsen (Noah Wyle) leads a group of scholars and adventurers who solve impossible mysteries, fight supernatural threats, and recover powerful artifacts, including the Ark of the Covenant, the Spear of Destiny, and Excalibur.

S1 : E1

And the Crown of King Arthur

Someone is killing off potential Librarians and it's up to Flynn Carsen and his new Guardian, Colonel Eve Baird, to save the three that are left.

S1 : E3

And the Horns of a Dilemma

The Librarians' first solo mission hits a snag when Baird loses the others in a mysterious Labyrinth that magically exists below the skyscraper of a modern corporation.

S1 : E4

And Santa's Midnight Run

When the Serpent Brotherhood wants to kill Santa, the Librarians must rescue him and help him accomplish the true, secret purpose of Christmas.

S4 : E5

And the Bleeding Crown

A Librarian from the past teams up with the Librarians of the present to take down an ancient and powerful enemy let loose in the modern day.

S4 : E6

And the Graves of Time

When Baird goes after Nicole Noone in an attempt to repair her rift with the Library, she ends up joining Nicole in a mission to retrieve a dangerous artifact before it falls into the hands of Russian grave robbers.

S4 : E7

And the Disenchanted Forest

When dissension threatens the group, Baird takes the Librarians to a charismatic self-help guru's team building camp on the edge of a forest where people have been mysteriously disappearing.

S4 : E8

And the Hidden Sanctuary

After Cassandra freezes up during a mission, she decides it's past time to go on a vacation. Searching for her ideal town, she lands on Havenport, the "Safest Town in America."

S4 : E9

And a Town Called Feud

When a Civil War reenactment in a town called Feud is plagued by ghosts, the Librarians have to uncover the truth of what really happened there over 100 years ago.

S4 : E10

And Some Dude Named Jeff

When Jenkins body-switches with a 28-year-old slacker named Jeff, he must find his way back into the Library to correct the mistake. But he will need a team to do it, and enlists the help of Jeff's hapless Dungeons & Dragons friends.

S4 : E11

And the Trial of the One

It's time to choose the singular Librarian to tether with Baird, but no one can decide so the Library takes it upon itself to help. Reducing the Librarians to their most primal selves and abandoning them in a landscape of their own nightmares.

S4 : E12

And the Echoes of Memory

After the world is morphed into a horrible and unrecognizable place – one where the Library never existed – it's up to Baird to bring the Librarians together before this bleak, knowledge-less world becomes the new reality.