While Sheldon is away in Texas, everyone gathers to decorate the apartment Christmas tree, and they each realize how much he has changed their lives.
While Sheldon is away in Texas, everyone gathers to decorate the apartment Christmas tree, and they each realize how much he has changed their lives.
Guest Cast
![Mary Cooper](https://static.tvmaze.com/uploads/images/medium_portrait/194/485044.jpg)
Laurie Metcalf
voices Mary Cooper![Carol Ann Susi](https://static.tvmaze.com/uploads/images/medium_portrait/4/10334.jpg)
Carol Ann Susi
voices Mrs. WolowitzCast Appearances
![Penny](https://static.tvmaze.com/uploads/images/medium_portrait/175/439563.jpg)
Kaley Cuoco
as PennyEpisode Discussion
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