Melissa Rauch

Pam's contractions begin but she and Jim are determined to wait it out as long as possible so they can have more time at the hospital. The rest of the office crew try to distract Pam from the pain with food and entertainment. Back at the office, Erin makes Andy jealous.

An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.

Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.

Penny gets help from Sheldon in order to understand what Leonard's work is, while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend.

After he's humiliated on National Public Radio, Sheldon vows to destroy Kripke, while Wolowitz tries not to destroy his new relationship with Bernadette.

Hoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about a friend's girlfriend.