Leonard and the gang buy a time machine prop that was used in a classic 1960s movie. However, their thrill over having a replica time machine is shot down when Penny tells them that their obsession with comics and toys is
Sheldon finds himself out of the gang’s Physics Bowl team and replaced with Leslie. Not taking this sitting down, Sheldon decides to start a team of his own to prove that he’s the best out of the gang.
Leonard and Sheldon meet a 15-year-old physics prodigy and Sheldon is thrown off that the boy is younger and smarter than himself. This leads the boys to try to come up with a way to restore Sheldon’s sense of self and ultimately decide to try to throw Dennis’ research.
Penny nurses a sick Sheldon back to health, unaware that the guys refuse to do so because he makes such a lousy patient.
Leonard tells Penny a lie so that he doesn’t have to hear her sing again, while Sheldon widens the lie, which makes Leonard in need to produce a phony cousin.
Sheldon and Leonard are asked to present their work at a physics conference together, but a fight ensues when Sheldon refuses to share the honor. When Penny steps in to mediate, things only get worse.
Koothrappali is overwhelmed after his parents arrange a blind date, but he discovers he actually can talk to the opposite sex after a few drinks; however, complications set in when his beautiful date is more interested in Sheldon.
Wolowitz seduces a friend of Penny’s. As they have taken over Penny’s apartment, Penny is forced to sleep on Leonard and Sheldon’s couch. The guys are also short one member on their HALO team, and they ask Penny to join them.
When the guys are invited to Penny’s Halloween party, Leonard sees it as an opportunity to get to know her friends and thereby get closer to her, but when her ex-boyfriend arrives, those plans take a turn for the worse. However, the evening isn’t without its positive aspects for Leonard. Or for Rajesh.
Leslie invites Leonard to play cello in a musical ensemble, but they have to practice at the guys’ apartment. Once practice is over, Leslie quickly seduces Leonard for a sexual encounter.
