'The Big Bang Theory' season 10 episode 10 spoilers: Sheldon and Leonard fight over shared belongings; Christopher Lloyd guest stars

A battle ensues when Leonard (Johnny Galecki) and Sheldon (Jim Parsons) argue over who will be the one to keep their shared belongings in the upcoming episode of the hit CBS sitcom "The Big Bang Theory" season 10.

Titled "The Property Division Collision," Thursday night's episode will explore a huge fight between Sheldon and Leonard. According to the official synopsis for episode 10, Sheldon and Leonard attempt to divvy up their shared stuff. However, things get complicated when they can't agree on anything. Elsewhere, Bernadette (Melissa Rauch) is already in the final weeks of her pregnancy and needs all the help she can get. As a result, Raj (Kunal Nayyar) and Stuart (Kevin Sussman) fight to be the most helpful during her pregnancy.

The episode will also see "Back to the Future" actor Christopher Lloyd in a guest starring role as Theodore.

In the sneak peak from CBS, one scene from the episode shows Sheldon opening a box filled with his old belongings. "Remember when we got this at Comic-Con?" he asks Leonard. "Oh yeah, the Mr. Spock cuckoo clock," the latter cheerfully replies.

While their partners Penny (Kaley Cuoco) and Amy (Mayim Bialik) look on, Sheldon asks Leonard about who should keep their favorite clock. Sheldon explains that he likes Spock and cares about clocks more than Leonard does, so the latter decided to just let him have the item.

Although everyone appears to be in a good mood in the sneak peak, the teaser for episode 10 shows a furious Sheldon storming out the apartment. He tells Amy they need to go, adding "I know when I'm not wanted." Meanwhile, Leonard begins to feel remorseful and asks Penny for advice on how he could make peace with his friend. Unfortunately, the promotional videos did not give anything away about Lloyd's mysterious character.

"The Big Bang Theory" season 10 airs every Thursday night at 8 p.m. EST on CBS.