Unfortunately, TV fans will have to wait an extra week for an all-new "The Big Bang Theory" episode on Thursday, Dec. 11.

In the Christmas-themed episode, titled "The Clean Room Infiltration," Leonard and Wolowitz will get into a tiff after a potential disaster at the university and then seek help from Raj.

Also during the episode, TV.com reports that Amy will plan a traditional Victorian dinner on Christmas Eve. Meanwhile Raj, Leonard, and Howard will scramble to remove a pigeon from the clean room at the university. In addition, Sheldon will turn into a Christmas Scrooge and purposely buy his girlfriend Amy the worst possible gift in order to make a point.

The official "The Big Bang Theory" Twitter account 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."

In the last episode, which was titled "The Champagne Reflection," Sheldon recorded the final installment of "Sheldon Cooper Presents Fun with Flags." Between balancing his full-time career and girlfriend, he decided that he no longer had time to dedicate to the popular Internet show.

During the series finale of the web series, Sheldon and Amy presented a highlight reel, featuring Amy as a kangaroo, Kripke playing "Flag or Not a Flag" and Sheldon in costume as Betsy Ross.

LeVar Burton was also the special guest in its finale, reports Movie News Guide.

Sheldon then ended the show with an emotional sendoff.

In the meantime, Leonard, Howard and Raj began to reflect upon their personal life achievements after they found a 50-year-old champagne bottle in a dead professor's office. The professor didn't open it because he never achieved anything worthy of the champagne his mother had bought him a half-a-century ago. As a result, the geeky gang pondered how they would feel if they died before completing their bucket list, reports Den of Geek.

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