Certain plot points
- Various items disappear from The Library.
- Flynn meets Ray Glasney, a strange man who can retrieve Library artifacts from his pocket.
- Ray is searching for the Staff of Zarathustra and needs The Eye to find it.
- Eve meets James Moriarty, who is pulled out of time.
- Moriarty comes into conflict with the Librarians when he tries to locate the Staff of Zarathustra.
- Jacob Stone's father, Isaac, is introduced.
- The Librarians investigate a mysterious hole in a Native American burial ground, which leads to a cave which is covered with mysterious markings. A shape-shifting monster is unleashed, who takes the forms of various characters.
- Rebecca Romijn as Eve Baird
- Christian Kane as Jacob Stone
- Lindy Booth as Cassandra Cillian
- John Kim as Ezekiel Jones
- John Larroquette as Jenkins
- Noah Wyle as Flynn Carsen (5 episodes)
- David S. Lee as James Moriarty (5 episodes)
- Richard Cox as Prospero (4 episodes)
- Beth Riesgraf as Lady of the Lake (2 episodes)
|1||And the Drowned Book||November 1, 2015|
|After months of being on their own, the librarians reunite to investigate a mysterious and massive storm that has appeared over Manhatten.|
|2||And the Broken Staff||November 1, 2015|
|Prospero summons several fictionals to aid him in retrieving the parts of his staff.|
|3||And What Lies Beneath the Stones||November 8, 2015|
|The Librarians must come clean and tell the truth to each other after a shape-shifting entity, that grows stronger when lies are told, is freed.|
|4||And the Cost of Education||November 15, 2005|
|Students begin vanishing at a university founded by a mad historian who believed in alternate dimensions.|
|5||And the Hollow Men||November 22, 2015|
|While chasing one of the artifacts missing from the Library, Flynn is kidnapped by a mysterious stranger who is suffering from amnesia and has a collection of all the missing artifacts.|
|6||And the Infernal Contract||November 29, 2015|
|In a small New Hampshire town, an old friend of Baird's who is running for Mayor finds himself embroiled in a scandal in the form of a missing intern and a literal contract with the Devil.|
|7||And the Image of Image||December 6, 2015|
|Mysterious events affecting young and beautiful clubbers lead the Librarians to a man in possession of a unique selfie.|
|8||And the Point of Salvation||December 13, 2015|
|The Clipping Book sends the team to a high-tech research facility where the researchers have become mindless monsters and the Librarians finds themselves stuck in a time loop.|
|9||And the Happily Ever Afters||December 20, 2015|
|Living ideal versions of their lives, the Librarians are drawn back together to investigate the appearance of Ariel, a sprite bound to serve Prospero.|
|10||And the Final Curtain||December 27, 2015|
|While Prospero, with renewed magic, creates havoc with the world's technology. Flynn and Baird must travel back to 1611 to battle Prospero and prevent his scheme to recreate a forest utopia.|