The group is arguing over Superman’s abilities and where he got those abilities from.
In this scene, the boys are training for the physics bowl, i.e., a quiz about physics. Sheldon wants to prove he is smarter than anybody else by answering all the questions.
Penny is in the shower and asks Leonard to do her a favor. Unfortunately, the favor is not what Leonard thought it would be.
Penny is getting new furniture, and as the delivery man just left, Leonard suggests that he and Sheldon bring it up themselves. Yet, this might be a problem.
The boys are enabling public access so everyone around the world can control their living room. Penny is not impressed, though.
Sheldon notices that someone has touched his board and changed some equations. He’s quite furious about it.
Leonard and Sheldon are having Penny over for the first time. Penny is very impressed with their boards containing complicated formulas.
Raj was out with Penny, and now he thinks she is his new girlfriend. So Raj introduces her to his parents.
Penny just got a role in a theatrical performance and wants to share the good news with Leonard and Sheldon.
Penny broke up with her ex-boyfriend, but she is upset about it as she is still loving him. So Leonard tries to comfort her.
Sheldon has no job at the moment. So he decides to accompany Penny to the Supermarket and do some grocery shopping.
Penny got a shelf from Ikea, and the boys are helping her with it. As always, they are overdoing it completely.
Howard wants to engage in a conversation with Summer Glau, a famous American actress. So he is working on his opening line.
Sheldon annoys Howard and Raj at work, and they send him away. Sheldon doesn’t fully understand why.
The group wants to participate in a robot fight against Barry Kripke. The only problem is that Kripke’s robot is incredibly massive.
Leonard wants to travel back in time and prevent himself from buying a time machine. Sheldon points out the futility of his plan.
Sheldon doesn’t know what to buy Penny for Christmas. Fortunately, he comes up with a solution.
Leonard and Sheldon try to retrieve Penny’s TV from her ex-boyfriend. But they’re having problems accessing the building.
Leslie is tired of waking up on strange futons and wants to slow things down in the future. So, Leonard seems to be the perfect fit.
Howard meets Summer Glau on a train and wants to ask her out. But she is not very impressed with him.