'The Librarians' season 4 episode 10 spoilers: Jenkins endangers Library when he switches bodies

Promotional photo for "The Librarians" Facebook/TheLibrarians

In the next episode of "The Librarians," Jenkins (John Larroquette) switches bodies with a slacker named Jeff (Andrew Caldwell), who risks the safety of the Library.

The trailer and promotional photos for the upcoming installment, which is titled "And Some Dude Named Jeff," were just recently released, and they show Jenkins in the body of the 28-year-old, unemployed Jeff. He looks in the mirror and is clearly shocked by the transformation. He realizes that he has to get back to the Library where Jeff is in his elderly body, pretending to be the caretaker of the secret facility. With the help of Jeff's Dungeons & Dragons buddies, Jenkins finds his way back to the library's secret entrance and tries to enter the premises. Eve Baird (Rebecca Romijn) sees the Jenkins-occupied Jeff in the monitor, and wonders why he wants to desperately enter the Library.

Jenkins realizes that Baird cannot hear him, so he writes a message on a big piece of cardboard which says, "I am Jenkins. My body has been switched."

However, Jeff is in the Library and will stop at nothing to drive the determined Jenkins out of the way. In the meantime, Baird, Ezekiel Jones (John Harlan Kim), Cassandra Cillian (Lindy Booth), and Jake Stone (Christian Kane) think that Jeff is the real Jenkins, and they get thwarted each time they try to get to the bottom of the body-switching situation.

In the last episode, Baird, Jones, and Stones went to the town called Feud to investigate ghost sightings during a Civil War reenactment celebration. They traced it to a magical locket that contained the spirits of two brothers that were at odds with each other because of the Civil War.

"The Librarians" season 4 episode 10 will hit the airwaves on Wednesday, Jan. 24, at 8 p.m. EST on the TNT network.

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