"The Maternal Congruence" is the second Christmas-themed episode of the CBS sitcom The Big Bang Theory, originally aired as the 11th episode from the third season (though it is the season's twelfth episode in production order). It aired on December 14, 2009.
A visit from Leonard's mother, Dr. Beverly Hofstadter (Christine Baranski), delights Sheldon and horrifies Leonard. Penny is upset because Leonard didn't mention his mother's visit to her, but that is nothing compared to when Leonard learns that Sheldon knows more about his own mother than Leonard does.
The episode was featured on The Big Bang Theory: The Complete Third Season DVD and Blu-ray sets, released on September 14, 2010. The episode was also included, along with "The Bath Item Gift Hypothesis" and "The Santa Simulation", on The Big Bang Theory Holiday Episodes DVD, released exclusively ay f.y.e. in 2013.
- "The Bath Item Gift Hypothesis"
- "The Santa Simulation"
- "The Cooper Extraction"
- "The Clean Room Infiltration"
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