The Big Bang Theory: The Clean Room Infiltration

The Big Bang Theory is all new!

Leonard and Wolowitz nearly come to blows and turn to Raj for help in dealing with a work emergency. Meanwhile, Amy throws an authentic Victorian Christmas party, and Sheldon seeks revenge on her for making him celebrate the holidays.

The Big Bang Theory stars Johnny Galecki, Jim Parsons, Kaley Cuoco-Sweeting, Simon Helberg, Kunal Nayyar, Mayim Bialik, and Melissa Rauch. In its eighth season, the series revolves around the misadventures of a group of socially awkward geniuses, best friends and roommates. In their free time, the gang continues to enjoy frequent trips to the comic book store and fantasy role-playing games with their ever-expanding universe of friends.

The Big Bang Theory is one of CBS's highest rated hits.

Tonight's episode will premiere at 8 p.m. EST on CBS.