• 'The Big Bang Theory' stars Jim Parsons, Kaley Cuoco and Johnny Galecki attend the The Paley Center for Media's 33rd Annual PALEYFEST in Hollywood, California.

'The Big Bang Theory' stars Jim Parsons, Kaley Cuoco and Johnny Galecki attend the The Paley Center for Media's 33rd Annual PALEYFEST in Hollywood, California. (Photo : Getty Images/Matt Winkelmeyer)

The show is on winter hiatus and fans will meet Hayley Wolowitz in 2017. "The Big Bang Theory" Season 10, episode 12 is not set to air on Dec. 22, 2016. Meanwhile, Kunal Nayyar, who plays Raj Koothrapali is in Delhi during the hiatus.

New Airdate - "The Big Bang Theory" Season 10, Episode 12

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After the winter premiere of the show is on Jan. 5, 2017 on CBS. The episode is titled "The Holiday Summation."

Meanwhile, Kunal Nayyar is back home in Delhi and he tweeted about being in Delhi during the winters.

"Ah Delhi. I love your smog, I love your traffic, I love your long black label dinners, I love your warmth, to me you are perfect. #home," Nayyar tweeted.

"The Big Bang Theory" Season 10, Episode 12 Spoilers

According to spoilers released by Wikia, Sheldon and Amy go to Texas and meet Mary. Meanwhile, Bernadette is frustrated as she cannot figure out why Hayley is crying. Elsewhere, Penny and Leonard go out to get a Christmas tree.

Episode 12 of the season starts with Penny and Leonard setting up snacks on the table and taking down the decorations for Christmas. Sheldon doesn't like the decorations up too late. He looks at the mistletoe. Penny asks them about their Texas trip.

The trip didn't go as planned and Amy had to use to drugs to make Sheldon board the flight.

In Texas, Sheldon and Amy meet Mary and Sheldon's mother is not offended by her son living with Amy before getting married. They also talk about Bernadette and Howard's baby.

"The Big Bang Theory" returns with new episodes in January.