Sheldon will turn into a Christmas Scrooge in Thursday's all-new, holiday-themed episode of "The Big Bang Theory."

Sheldon has made it clear that he hates Christmas, which is why he becomes so upset when Amy decides to throw a traditional Victorian dinner on Christmas Eve, TV.com reports. As a result, he tells her that it violates his plans and will seek revenge against his girlfriend.

A newly released preview video of the upcoming episode, which is titled "The Clean Room Infiltration," reveals that Sheldon will purposely buy Amy the worst possible gift in order to prove a point.

"Let's find the kind of gift that makes her feel small and worthless," he tells Bernadette while the two are at a shopping mall in the clip.

In the meantime, Leonard and Wolowitz will spend Christmas Eve in the lab and get into a tiff after a potential disaster at the university. As a result, they will seek help from Raj, and which leads to the three friends scrambling to remove a pigeon from the clean room at the university. They will also try their best to stop the bird from getting near their experiment, but the bird causes a huge mess, reports UnRealityTV.

The official "The Big Bang Theory" Twitter account also tweeted out a spoiler about the next episode, writing: "How dare she? Sheldon seeks revenge on Amy for making him celebrate the holidays."

According to a CBS press release published on SpoilerTV.com, the official synopsis states:

"Leonard and Wolowitz nearly come to blows and turn to Raj for help in dealing with a work emergency. Meanwhile, Amy throws an authentic Victorian Christmas party, and Sheldon seeks revenge on her for making him celebrate the holidays."

"The Big Bang Theory" Season 8, Episode 9, "The Clean Room Infiltration," will air on Thursday, Dec. 11 at 8 p.m. on CBS.

Watch a preview video below.

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