• 'The Big Bang Theory' stars Mayim Bialik, Jim Parsons, Kaley Cuoco, Johnny Galecki and Simon Helberg attend The Paley Center For Media's 33rd Annual PALEYFEST Los Angeles.

'The Big Bang Theory' stars Mayim Bialik, Jim Parsons, Kaley Cuoco, Johnny Galecki and Simon Helberg attend The Paley Center For Media's 33rd Annual PALEYFEST Los Angeles. (Photo : Getty Images/Matt Winkelmeyer)

"The Big Bang Theory" Season 10, episode 12 titled "Holiday Summation" that will be skipping the holidays for two weeks will be back on Jan.5, 2017. Sheldon Cooper (Jim Parsons) and Amy Fowler (Mayim Bialik) will be the center of the upcoming episode, which may be the season's finale.

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 [ WARNING: THIS POST CONTAINS SPOILERS FROM 'THE BIG BANG THEORY' SEASON 10, EPISODE 12.]

"The Big Bang Theory" Season 10, episode 12 will be a post-holiday recap for the entire gang. Each one of them will be narrating their stories of how they spent the holidays, The Hollywood Reporter reported.

When the new episode returns, some scenes will be focused on Sheldon and Amy's vacation at his mother Mary (Laurie Metcalf) in Texas. Based on their narration, they had a terrible experience as Mary found out that the two are already living together.

As of the updates of "The Big Bang Theory" Season 10, episode 12, it looks like that Amy had informed Mary of their cohabitation. Although Mary is somewhat religious and conservative, the shocking news surprised Sheldon more. He was a bit upset that Amy told his mom about their living arrangement without even consulting him.

Meanwhile, although Sheldon and Amy only agreed to stay at Penny's (Kaley Cuoco) apartment for five weeks, it seems the arrangement would be heading to a permanent stay. Sheldon is said to be slowly migrating some of his things to Penny's apartment.

"He's loathe to conduct a wholesale revamp of what is essentially one of the show's three iconic sets," showrunner Steve Molaro told TVLine. "Those three sets are baked into the DNA of the show, so I'd like to not make drastic changes there."

In another part of "The Big Bang Theory" Season 10, episode 12, Penny and Leonard Hofstadter  (Johnny Galecki) will be seen celebrating the best Christmas of their lives. However, the Christmas spirit would not last long for the newlywed because they have decided to cut down their own Christmas tree.

As the gang narrated their holiday stories, the new parents, Bernadette and Howard Wolowitz (Simon Helberg) find the first week of their baby Halley extra challenging as she could not even stop the baby from crying. The couple finds the first week very hard and not able to celebrate the holidays.

No updates yet were given whether there will be Season 11 for the popular comedy series. "The Big Bang Theory" Season 10, episode 12 airs at 8:00 p.m. on CBS. 

Check out the promo trailer of "The Big Bang Theory" new episode: