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Summary: A fight between Leonard and Penny threatens their relationship, while Sheldon battles Wil Wheaton in bowling.
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Summary: Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award.
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Summary: When the guys find a ring from "The Lord of the Rings" at a garage sale, it threatens to tear them apart.
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Summary: Sheldon winds up in traffic court when he gets a ticket because of Penny.
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Summary: Leonard can only bring one guest on a trip to see CERN's Large Hadron Collider (the world's largest and highest energy particle accelerator) in Switzerland on Valentine's Day.
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Summary: Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny.
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Summary: A robbery of their apartment sees Leonard and Sheldon call on their friends to devise a security system.
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Summary: A robbery of their apartment sees Leonard and Sheldon call on their friends to devise a security system.
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Summary: Leonard is aghast to find out a secret of Penny's: she believes in psychics. Meanwhile, Sheldon tries to assist Koothrappali in picking up a girl at a university party.
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Summary: Leonard's mother (Christine Baranski) visits, which pleases Sheldon but upsets Leonard. .
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Summary: Sheldon attempts to help Penny understand Leonard's work, and Wolowitz becomes jealous when Leonard starts hanging out with his new girlfriend.
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Summary: Barry Kripke embarrasses Sheldon on NPR, and the gang rallies to help him get his revenge. Wolowitz, desperate to keep his romance with Bernadette alive, gets advice from a fantasy version of Katee Sackhoff.
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Summary: With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.
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Summary: With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.
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Summary: A squabble between Leonard and Penny sees Sheldon playing mediator, though out of his own incovenience from the sitiation rather than altruism.
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Summary: Sheldon teaches Leonard how to understand football while a kite-fighting incident threatens Howard and Raj's friendship
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Summary: Sheldon seeks revenge on his nemesis, Wil Wheaton; Wolowitz wants Penny to set him up with one of her friends.
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Summary: Raj must find a new job or be sent back to India, but Sheldon has a solution, which leaves Leonard and Penny dealing with Howard as third wheel.
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Summary: Howard takes Raj along to check out the Goth dating scene. Sheldon uses chocolate as part of a behavior modification experiment on Penny.
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Summary: Sheldon and Howard wager comic books over a cricket's species. Meanwhile, a less-than-perfect romantic night agonizes Leonard and Penny.
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Summary: Sheldon flees back to Texas in disgrace when he learns the guys tampered with his arctic expedition data, forcing the guys to follow him and threatening Leonard's hopes for a romantic encounter with Penny.
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Summary: Leonard comforts Penny after she breaks up with her boyfriend, again. After asking her out on a date they each turn to Sheldon for advice. Also, Howard teaches Sheldon Mandarin so he can complain about his no...
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Summary: After finding out Leonard has never had a birthday party Penny decides to throw one for him (and forces Sheldon to join her). Unfortunately things do not go as planned and Wolowitz ends up in the emergency roo...
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Summary: When Sheldon's attractive twin sister Missy comes to visit the guys fight over her. Sheldon ends up trying to be protective of her, much to her displeasure.
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Summary: Leonard buys a replica time machine online. As the boys move it into the apartment they accidentally make Penny late for work causing her to lash out at Leonard for his nerdy ways. Upset, Leonard decides to ge...
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Summary: The guys decided to compete in a physics bowl but find Sheldon's showboating too much and kick him off the team. Upset, Sheldon forms his own team to compete against them.
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Summary: Sheldon and Leonard look for a way to derail a 15-year-old physics prodigy's research.
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Summary: Sheldon and Leonard look for a way to derail a 15-year-old physics prodigy's research.
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Summary: When Sheldon gets sick, Leonard and the boys know what's in store and avoid him like the plague, leaving an unsuspecting Penny to nurse the world's worst patient back to health.
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Summary: After hearing Penny sing, Leonard lies to avoid seeing her perform, but Sheldon takes it one step further with a more elaborate lie that leads to the appearance of his non-existent cousin.
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Summary: When Sheldon and Leonard are invited to present their joint findings at a physics conference, Sheldon refuses. But when Penny steps in to mediate, it only deepens the rift between the two best friends.
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Summary: Koothrappali's parents want him to go out with another Indian woman with the hopes of initiating a pre-arranged marriage. But his date turns out to have more in common with Sheldon.
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Summary: When Wolowitz hooks up with Penny's old friend, it ruins "Halo Night" for the rest of the guys.
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Summary: The guys are invited to Penny's Halloween costume party. During the party, Leonard has a run-in with Penny's ex-boyfriend.
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Summary: Leonard and his colleague Leslie spend the night together. But Leslie tells Leonard after the fact that she's only interested in a one-night stand.
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Summary: Sheldon's mother visits to get him out of the funk he's in after he is fired for disrespecting his new boss.
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Summary: Leonard gets upset when he discovers that Penny is seeing a new guy, so he tries to trick her into going on a "date" with him.
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Summary: Penny is furious and more than a little freaked out with Leonard and Sheldon when they sneak into her apartment overnight, and clean it while she is sleeping.
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Summary: A pair of brilliant theoretical physicists meet a woman who shows them how little they know about the real world.