Amy Throws a Victorian Christmas Party in "The Clean Room Infiltration"

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
Working in the lab

2. Working in the lab

Leonard (Johnny Galecki, right) and Wolowitz (Simon Helberg, center) have trouble and turn to Raj (Kunal Nayyar, left) for help in dealing with a work emergency, on THE BIG BANG THEORY, Thursday, Dec. 11 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2014 WBEI. All rights reserved.
Sheldon and Bernadette

3. Sheldon and Bernadette

Amy throws an authentic Victorian Christmas party, and Sheldon (Jim Parsons, left) 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. Also pictured: Melissa Rauch (right) Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2014 WBEI. All rights reserved
Raj comes to help

4. Raj comes to help

Leonard (Johnny Galecki, right) and Wolowitz (Simon Helberg, center) run into trouble and turn to Raj (Kunal Nayyar, left) for help in dealing with a work emergency, on THE BIG BANG THEORY, Thursday, Dec. 11 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2014 WBEI. All rights reserved.
Giving Amy a present

5. Giving Amy a present

Amy (Mayim Bialik, right) throws an authentic Victorian Christmas party, and Sheldon (Jim Parsons, left) 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. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2014 WBEI. All rights reserved
Amy throws a Christmas party

6. Amy throws a Christmas party

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: (seated) Simon Helberg, Melissa Rauch, Kunal Nayyar, Brian George, Jim Parsons, Mayim Bialik, (standing) Kaley Cuoco-Sweeting and Johnny Galecki, Photo: Michael Ansell/Warner Bros. Entertainment Inc. © 2014 WBEI. All rights reserved.
Giving gifts

7. Giving gifts

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: (seated) Simon Helberg, Brian George, Kunal Nayyar, Jim Parsons (standing) Melissa Rauch,Kaley Cuoco-Sweeting and Johnny Galecki and Mayim Bialik Photo: Michael Ansell/Warner Bros. Entertainment Inc. © 2014 WBEI. All rights reserved.
Wolowitz and Leonard

8. Wolowitz and Leonard

Leonard (Johnny Galecki, right) and Wolowitz (Simon Helberg, left) nearly come to blows and turn to Raj for help in dealing with a work emergency, on THE BIG BANG THEORY, Thursday, Dec. 11 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Michael Ansell/Warner Bros. Entertainment Inc. © 2014 WBEI. All rights reserved.
The gang hangs out

9. The gang hangs out

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: Simon Helberg, Johnny Galecki, Melissa Rauch, Mayim Bialik and Jim Parsons Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2014 WBEI. All rights reserved
Using a fire extinguisher

10. Using a fire extinguisher

Leonard (Johnny Galecki, left) and Wolowitz (Simon Helberg, right) nearly come to blows and turn to Raj for help in dealing with a work emergency, on THE BIG BANG THEORY, Thursday, Dec. 11 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Photo: Michael Ansell/Warner Bros. Entertainment Inc. © 2014 WBEI. All rights reserved.
Sheldon

11. Sheldon

Amy throws an authentic Victorian Christmas party, and Sheldon (Jim Parsons, pictured) 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. Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2014 WBEI. All rights reserved
Dealing with a work emergency

12. Dealing with a work emergency

Leonard and Wolowitz run into trouble and turn to Raj for help in dealing with a work emergency, on THE BIG BANG THEORY, Thursday, Dec. 11 (8:00-8:31 PM, ET/PT), on the CBS Television Network. Pictured left to right: Johnny Galecki, Simon Helberg, and Kunal Nayyar Photo: Michael Ansell/Warner Bros. Entertainment Inc. © 2014 WBEI. All rights reserved.
Eating together

13. Eating together

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: Simon Helberg, Johnny Galecki, Melissa Rauch, Mayim Bialik, Jim Parsons, Kaley Cuoco-Sweeting and Kunal Nayyar Photo: Michael Yarish/Warner Bros. Entertainment Inc. © 2014 WBEI. All rights reserved