"The Clean Room Infiltration" is the fifth Christmas-themed episode of the television series The Big Bang Theory, originally aired as the eleventh episode of the show's eighth season, on December 11, 2014.
Amy hosts a traditional English Victorian Christmas Eve dinner for the gang while the guys are conducting an experiment in the university clean room and accidentally let a bird in. To prove a point to Amy, a Scrooge-like Sheldon buys her the perfect gift to ruin her Christmas.
The episode is available on The Big Bang Theory: The Complete 8th Season DVD and Blu-ray sets, released September 15, 2015.
|Jim Parsons||Sheldon Cooper|
|Johnny Galecki||Leonard Hofstadter|
|Simon Helberg||Howard Wolowitz|
|Kunal Nayyar||Rajesh Koothrapalli|
|Mayim Bialik||Amy Farrah Fowler|
|Melissa Rauch||Bernadette Rostenkowski-Wolowitz|