Celebrate Christmas with Sheldon, Leonard, Penny, Howard, Raj, Amy and Bernadette in these classic Christmas episodes of The Big Bang Theory.
The Bath Item Gift Hypothesis
Season 2, Episode 11 - Aired December 15, 2008
Leonard starts working with a cool, handsome colleague at work, but things go awry when the colleague starts dating Penny. Meanwhile, Sheldon's obsessive gift-giving etiquette irritates the whole gang, while Penny's Christmas gift for Sheldon leads to a memorable moment.
The Maternal Congruence
Season 3, Episode 11 - Aired December 14, 2009
Leonard's mother, Dr. Beverly Hofstadter, is in town over the Christmas holiday. His mother's visit is distressing for Leonard, especially after she finds out about his relationship with Penny. Sheldon, however, is pleased to spend time with Dr. Hofstadter, whose analytical mind he finds enthralling.
The Santa Simulation
Season 6, Episode 11 - Aired December 13, 2012
Sheldon is haunted by the memories of Christmas past when the guys play a festive game of Dungeons and Dragons. Elsewhere, Amy, Penny and Bernadette try find a girl for Raj when he joins them on ladies' night.
The Cooper Extraction
Season 7, Episode 11 - Aired December 12, 2013
When Sheldon flies back to Texas for his sister's childbirth, the gang gather to decorate the apartment's Christmas tree. When they begin to wonder what life would be like without Sheldon, they come to realize how big a part of their lives he has become.
The Clean Room Infiltration
Season 8, Episode 11 - Aired December 11, 2014
Leonard and Howard are performing an experiment in the university clean room, but when they accidentally let a bird in they need Raj's help. Meanwhile, as Amy hosts an authentic Victorian Christmas party, Sheldon resents her forcing him to celebrate the holidays and shops for the perfect gift to ruin Christmas.
The Holiday Summation
Season 10, Episode 12 - Aired January 5, 2017
When the gang gets together for the first time in the New Year, they catch each other up on their holidays. Sheldon and Amy recount the tale of their trip to Texas to see Sheldon's mother, Mary; Leonard and Penny chronicle their struggle with a Christmas tree, and Bernadette describes her first few days caring for Halley.