Raj his on Penny, with a lot of confidence following getting a paper published.

Sheldon introduces Penny to online gaming, which accidently creates a monster!

Leonard sees Penny with a handsome new guy, so he starts dating Sheldon’s nemesis, Leslie Winkle.

Penny opens up to a reluctant Sheldon after a “less than stellar” fist date with his friend Leonard.

Penny breaks up with her boyfriend, and Leonard comforts her. After he asks her out on a date, both of them turn to Sheldon for advice. Also, Howard teaches Sheldon “Mandarin” so he can complain about his “not so tangerine-Tangerine Chicken”!

Penny finds out that Leonard has never had a birthday party, then she decides to throw one for him. Unfortunately, things don’t go as planned and Howard ends up in the emergency room.

Sheldon’s attractive twin sister “Missy” comes over to visit, and the guys end up fighting over her. Sheldon ends up trying to be so protective of her, much to her displeasure.

Leonard buys a replica time machine online. As the boys move it to the apartment, they make Penny late for work, by accident, causing her to lash out at Leonard for his nerdy ways. Upset, Leonard gets rid of all his “nerdmabelia” and the guys try to convince him not to.

The guys decided to compete in a physics bowl, then they find out that Sheldon is showboating too much, and kick him off the team. Upset, Sheldon decides to form his own team to compete against them!

Leonard and Sheldon look for a way to derail a fifteen year old physics prodigy’s research.