Photo Flash: THE BIG BANG THEORY's Holiday Episode, Set to Air 12/13

Check out a first look at THE BIG BANG THEORY's upcoming holiday episode, "The Santa Simulation," set to air Dec. 13 on CBS!

"The Santa Simulation" – Sheldon revisits some Christmas memories during a game of Dungeons and Dragons, while Penny, Bernadette and Amy try to find a girl for Koothrappali when he joins the girls for ladies' night, on THE BIG BANG THEORY, Thursday, Dec. 13 (8:00 – 8:31 PM, ET/PT) on the CBS Television Network.

Photo Credit: Monty Brinton/CBS

Kevin Sussman, Jim Parsons, Johnny Galecki

Jim Parsons

Simon Helberg, Kevin Sussman Jim Parsons

Kaley Cuoco

Kaley Cuoco, Melissa Rauch, Mayim Bialik