Melissa Rauch

An embarrassing secret of Wolowitz's comes to light as he tries to win back his ex-girlfriend, Bernadette; Sheldon and Raj have a small war at work.

Leonard realises that he's the only one of the gang without a girlfriend, while Sheldon wants to get rid of his when she hatches a plan for him to meet her mother.

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.

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.

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, and camp out to get tickets for the film.

Amy finds she has sexual feelings for Penny's ex-boyfriend Zack, while Koothrappali and Wolowitz try to prove who would be the better superhero.