The Celebration Reverberation The Big Bang Theory : Season 11 Episode 11
TV-PG CBS 22m int(0)
Aired: December 14th, 2017 @ 8:00 PM EST on CBS
Sheldon and Wolowitz plan birthday celebrations for Amy and Halley, respectively. Also, Leonard get a Christmas letter from his brother that causes him to spiral out about his own lack of accomplishments.