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.

Bill wants to earn back Sookie's trust but once again brings her close to danger. Eric tempts Russell with the "ultimate vampire dream" and Jason tries to comprehend what he's learned about Crystal.

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

When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she regrets.

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

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