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

Geeks and jocks have different ideas on the meaning of the "Big Bang" theory.

Leonard hangs out with Penny's friends but ultimately has no interest in football

Howard tries to make amends with Raj

Leonard discovers that Penny hides him from her friends

Sheldon teaches Leonard about football so he can fit in with Penny's friends

Leonard learns about football from an unlikely tutor, on "The Big Bang...