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When Leonard finally works up the courage to ask Penny out on a date, they each turn to Sheldon for advice.
When Leonard finally asks Penny out on a date and she says yes, they each seek the "wisdom" of reluctant advisor, Sheldon. Despite reluctance on both sides, they end up going out on their date after a preemptive kiss.
Penny learns that Leonard does not celebrate birthdays, so she plans a surprise party; Sheldon unexpectedly gets to live out one of his biggest fantasies in an electronics store.
Leonard devises a plan to eliminate his rivals when he, Wolowitz and Koothrappali all fall for Sheldon's twin sister, but his plan backfires when Sheldon decides to choose who his sister dates.
Leonard and the guys buy a time machine prop from a classic movie; Penny tells the guys their obsession with comics and toys is pathetic.
When Leonard and the guys buy a time machine prop from a classic 1960 movie, its arrival creates problems for Penny and she tells the boys that their obsession with comics and toys is "pathetic." Stung by Penny's outburst, Leonard decides to give up his time machine and other geeky pleasures for...
When Sheldon tries to prove his mental superiority as they train for the Physics Bowl, the guys kick him off the team and bring his nemesis (Sara Gilbert) aboard.
Sheldon and Leonard look for a way to derail a 15-year-old physics prodigy's research.
Leonard and the boys avoid Sheldon when he gets sick, leaving Penny to nurse him back to health.
Leonard and Sheldon try to avoid seeing Penny perform after hearing her sing, but the elaborate lie Sheldon tells leads to an unexpected result.
Penny tries to mediate when Sheldon and Leonard disagree on whether to present their joint findings at a physics conference.
On a blind date, Koothrappali discovers that he can talk to the opposite sex after a few drinks, but his date takes an interest in Sheldon.
Penny sleeps on Leonard and Sheldon's couch when Wolowitz seduces her friend and takes over her apartment; in need of a fourth member, the guys ask Penny to join their ``Halo'' team.
Leonard, Sheldon, Wolowitz and Koothrappali attend Penny's Halloween party.
Leonard, realizing his pursuit of Penny is fruitless, has an unexpected encounter with a fellow scientist (Sara Gilbert).
Getting fired gives Sheldon the opportunity to explore life beyond physics, but when he spends his time weaving ponchos and acting like a shut-in, Leonard calls Sheldon's mother for assistance.
Unhappy to learn that Penny is seeing someone, Leonard summons the courage to ask another woman on a date.
Leonard volunteers to sign for a package, hoping to make a good impression on Penny.
Leonard is happy to meet new neighbor Penny, but his roommate thinks he is chasing an impossible dream.
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