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.

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

Sheldon and Raj go to a university party, Leonard disapproves of Penny's belief in psychics and Raj lusts after a girl named Abby whom he meets at the party.

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

When Penny's dad comes to visit, Leonard discovers that she told her parents they were back together because they always had a soft spot for him.

Priya uses her legal nous to dissect the roommate agreement and put Sheldon in his place. Meanwhile, the girls take Sheldon dancing.