'The Big Bang Theory' season 10 episode 12 spoilers: The gang shares their horrible trips as they reunite post-holidays

"The Big Bang Theory" season 10 will be back next year with some surprises as Sheldon (Jim Parsons) and company move past the holidays and into the brand-new year.

For a kickoff, Sheldon's mother, Mary (Laurie Metcalf) will be back in "The Holiday Summation," to join her son and his friends for their holiday dealings.

These dealings, as seen in the promo for "The Big Bang Theory" season 10, episode 12, include "acting odd intentionally" and making some really bad vacation decisions.

The promotional stills for the episode show Sheldon wearing underwear over his head and walking around the house. In several images, he was seen sharing a meal with his mother and Amy (Mayim Bialik).

One photo suggests that this meal will take a turn for the worse. One second, they are preparing to eat. The next Sheldon was seen standing over his mother looking very unhappy.

Spoiler Alert! The following contains plot spoilers for "The Big Bang Theory" season 10, episode 12. Read at your own discretion.

It turns out that this was his way of protesting to his mother for thinking that he will not settle down especially after they tell Mary he and Amy are living together now.

Sheldon will not be the only one displeased in "The Big Bang Theory" season 10, episode 12. Leonard (Johnny Galecki) and Penny (Kaley Cuoco) are not the happiest couple around, too.

The couple went to Texas for their holiday adventure, which turned out to be a complete disaster as they met misfortune after misfortune.

Howard (Simon Helberg) and Bernadette (Melissa Rauch) are not having the best time in "The Big Bang Theory" season 12, episode 10 as well.

Baby Hallie won't stop crying and they have run out of ways to make her stop. Bernadette is definitely a wreck, but it looks like Howard is not all that bothered.

The couple's disaster stories will be told to each other when they reunite post-holidays in "The Big Bang Theory" season 10, episode 12, "The Holiday Summation," airing Thursday, Jan. 5, at 8 p.m. ET on CBS.