Melissa Rauch

Sheldon enters a competition but is annoyed when he finds out that `Star Trek' actor Wil Wheaton is participating because Wil cancelled his appearance at a sci-fi convention that Sheldon had attended as a child.

Bernadette receives her PhD and the gang begin to tease Wolowitz for being the only one among them who isn't a doctor. Meanwhile, Koothrappali becomes Sheldon's new flatmate after hearing Leonard and Priya engaging in a `Star Trek' bedroom fantasy.

Sheldon has `theorist block' and is finding it difficult to muddle through a formula he's been working on. Taking inspiration from Albert Einstein, he takes a job at the Cheesecake Factory to try to kick start his creativity.

After he's humiliated on National Public Radio, Sheldon vows to destroy Kripke (guest star John Ross Bowie), and the guys help Sheldon exact his revenge. Meanwhile, Wolowitz tries not to destroy his new relationship with Bernadette (guest star Melissa Rauch). Katee Sackhoff (Battlestar Galactica) makes a cameo as Wolowitz’s dream girl.

Leonard realizes he's the only one without a girlfriend, while Sheldon wants to get rid of his.