Sheldon must come to Penny's rescue. Monday, November 16th on CBS.

Sheldon goes to Penny and begs her to apologize to Leonard

Penny and Leonard reassure Sheldon that everything will be okay, despite the fighting

Leonard and Penny are still fighting and it almost makes the boys late for a movie

Leonard is less than thrilled when Penny invites her guy friend to crash on her couch

Sheldon can't handle Leonard and Penny's fighting

Get a behind the scenes look into the Big Bang Theory season finale

What do all these images have in common? You'll have to watch to find out

Catch up with CBS's favorite geeks, those wacky boys from The Big Bang Theory and Charlie Epps,...

Leonard and Sheldon go on a noble quest