As the Warehouse team prepares to celebrate the holidays in snowy South Dakota, Pete and Myka are called upon to hunt down a malevolent Santa Claus. Meanwhile, in time for Hanukkah, Artie and his estranged father, Isadore Weisfelt reunite after 30 years.

When Ted’s new friendship with Zoey tests the theory that single men and married women can’t be friends, he invites her husband, « The Captain, » to hang out with them. Meanwhile, Marshall and Robin decide to spend alone time together, and Barney and Lily possibly have a fight.

It is Troy’s 21st birthday, so the group decides to hit the bars. While Britta and Jeff are drinking too many cocktails, Shirley is taking down incriminating pictures of herself, Annie is embracing her fake identity and Abed gets into a deep conversation with another Sci-Fi lover.

Peter struggles to cope with recent events; Olivia searches for an ally; a device that communicates between universes is discovered…

The crew’s new-found control over Destiny’s flight path introduces new risks when they find themselves in the middle of a war between two races.

Mitchell tries to tell Cameron how he feels uncomfortable with his mom, Barb Tucker. Haley breaks up with Dylan to Phil’s dismay and Claire’s delight. Jay has a little stomach ache that gets exacerbated when he and Manny look it up on the Internet.