1. "The Clean Room Infiltration"
Amy throws an authentic Victorian Christmas party, and Sheldon seeks revenge on her for making him celebrate the holidays, on THE BIG BANG THEORY, Thursday, Dec. 11 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Pictured left to right: Brian George, Kaley Cuoco-Sweeting and Mayim Bialik Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2014 WBEI. All rights reserved