Penny feels left out when Bernadette shows an interest in science and asks Sheldon to teach her about science. Eventually, she surprises everyone with what she's learned.
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.
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.
Leonard realizes he's the only one without a girlfriend, while Sheldon wants to get rid of his.
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.