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.

An embarrassing secret of Wolowitz's is revealed; Raj and Sheldon get into a war at work.

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

The gang are excited about a new screening of `Indiana Jones and Raiders of the Lost Ark' because there are 21 seconds of additional footage being seen for the first time.

Tensions run high when Bernadette runs into her hulk of an ex-boyfriend at a science conference. Threatened by Bernadette's ex-boyfriend, Wolowitz has an argument with Bernadette and causes chaos.