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| The Big Bang Theory Season 3 : |
| Worlds collide in Season 3! A love affair with Penny has opened a big wide wonderful world of romance for Leonard. But Sheldon likes the world just the way it was thank you. All of which makes for a zany comic triangle with brainy clueless Sheldon and practical grounded Penny hilariously vying for the role of hypotenuse. |
| Episode 1 - [The Electric Can Opener Fluctuation] |
| Details : When Sheldon learns the guys tampered with his expedition data he got from the arctic he leaves to Texas in disgrace. This results in the guys following him which threatens Leonard's hope for some romantic time with Penny and the guys' friendship with Sheldon. |
| Guest Cast and Crew : John Ross Bowie as Barry Kripke | Laurie Metcalf as Mary Cooper | |
| Air Date : Sep. 21, 2009 | Rating ➦ ★★★★★★★ |
| Episode 2 - [The Jiminy Conjecture] |
| Details : Leonard and Penny struggle to recover from an awkward first hookup while Sheldon and Howard stake their best comic books on a bet to determine the species of a cricket. |
| Guest Cast and Crew : Lewis Black as Professor Crawley | Writer : Jim Reynolds | Director : Mark Cendrowski | |
| Air Date : Sep. 28, 2009 | Rating ➦ ★★★★★★★ |
| Episode 3 - [The Gothowitz Deviation] |
| Details : Howard and Raj visit a Goth nightclub to pick up women while Sheldon attempts to build a better Penny using chocolate-based behavior modification. |
| Guest Cast and Crew : Molly Morgan as Bethany | Sarah Buehler as Sarah | Andy Mackenzie as Skeeter | Director : Mark Cendrowski | |
| Air Date : Oct. 05, 2009 | Rating ➦ ★★★★★★★ |
| Episode 4 - [The Pirate Solution] |
| Details : 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 a third wheel. |
| Guest Cast and Crew : Elizabeth Bogush as Catherine Millstone | Oliver Muirhead as Professor Laughlin | |
| Air Date : Oct. 12, 2009 | Rating ➦ ★★★★★★★ |
| Episode 5 - [The Creepy Candy Coating Corollary] |
| Details : After overhearing that Wil Wheaton is entering a trading-card competition Sheldon decides to enter it himself. Meanwhile Penny sets up one of her friends on a date with Wolowitz. |
| Guest Cast and Crew : Wil Wheaton as Himself | Kevin Sussman as Stuart Bloom | Melissa Rauch as Bernadette Rostenkowski | |
| Air Date : Oct. 19, 2009 | Rating ➦ ★★★★★★★ |
| Episode 6 - [The Cornhusker Vortex] |
| Details : Sheldon becomes Leonard's teacher in order to understand football while an incident with flying a kite threatens Howard and Raj's friendship. |
| Guest Cast and Crew : Zachary Abel as Todd | Jason Mesches as Denny | |
| Air Date : Nov. 02, 2009 | Rating ➦ ★★★★★★ |
| Episode 7 - [The Guitarist Amplification] |
| Details : A squabble between Leonard and Penny sees Sheldon playing mediator though out of his own incovenience from the sitiation rather than altruism. |
| Guest Cast and Crew : Alice Amter as Mrs. Koothrappali | Carol Ann Susi as Debbie Wolowitz (voice) | Brian George as V.M. Koothrappali | Kevin Sussman as Stuart Bloom | |
| Air Date : Nov. 09, 2009 | Rating ➦ ★★★★★★★ |
| Episode 8 - [The Adhesive Duck Deficiency] |
| Details : With Leonard Howard and Raj away camping in the desert an injured Penny has only Sheldon to rely on. |
| Air Date : Nov. 16, 2009 | Rating ➦ ★★★★★★★★ |
| Episode 9 - [The Vengeance Formulation] |
| Details : After he's humiliated on National Public Radio Sheldon vows to destroy Kripke while Wolowitz tries not to destroy his new relationship with Bernadette. |
| Guest Cast and Crew : Carol Ann Susi as Debbie Wolowitz (voice) | Ira Flatow as Himself (voice) | Katee Sackhoff as Herself | John Ross Bowie as Barry Kripke | Melissa Rauch as Bernadette Rostenkowski | |
| Air Date : Nov. 23, 2009 | Rating ➦ ★★★★★★★ |
| Episode 10 - [The Gorilla Experiment] |
| Details : Penny gets help from Sheldon in order to understand what Leonard's work is while Wolowitz develops a jealousy when Leonard starts hanging out with his new girlfriend. |
| Guest Cast and Crew : Carol Ann Susi as Debbie Wolowitz (voice) | Melissa Rauch as Bernadette Rostenkowski | |
| Air Date : Dec. 07, 2009 | Rating ➦ ★★★★★★★ |
| Episode 11 - [The Maternal Congruence] |
| Details : A Christmas visit from his mother has Leonard discovering she's kept a lot of news from him that she shares with Sheldon and worrying if she'll approve of his romance with Penny. |
| Guest Cast and Crew : Christine Baranski as Beverly Hofstadter | |
| Air Date : Dec. 14, 2009 | Rating ➦ ★★★★★★★ |
| Episode 12 - [The Psychic Vortex] |
| Details : 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 mixer. |
| Guest Cast and Crew : Danica McKellar as Abby | David Trice as Waiter | Jen Drohan as Martha | Melissa Rauch as Bernadette Rostenkowski | |
| Air Date : Jan. 11, 2010 | Rating ➦ ★★★★★★★ |
| Episode 13 - [The Bozeman Reaction] |
| Details : When their apartment is robbed Leonard and Sheldon turn to their friends to create a state-of-the-art security system. |
| Guest Cast and Crew : Julio Oscar Mechoso as Officer Hackett | Artie O'Daly as Young Man | |
| Air Date : Jan. 18, 2010 | Rating ➦ ★★★★★★★ |
| Episode 14 - [The Einstein Approximation] |
| Details : Sheldon's search for the answer to a physics problem leads him to work at the Cheesecake Factory with Penny. |
| Guest Cast and Crew : Yeardley Smith as Sandy | Kevin Brief as Glen | Melissa Rauch as Bernadette Rostenkowski | |
| Air Date : Feb. 01, 2010 | Rating ➦ ★★★★★★★ |
| Episode 15 - [The Large Hadron Collision] |
| Details : 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. |
| Air Date : Feb. 08, 2010 | Rating ➦ ★★★★★★★ |
| Episode 16 - [The Excelsior Acquisition] |
| Details : Sheldon winds up in traffic court when he gets a ticket because of Penny. |
| Guest Cast and Crew : Marcus Folmar as Guard | Stan Lee as Himself | Steve Paymer as Judge J. Kirby | Kevin Sussman as Stuart Bloom | |
| Air Date : Mar. 01, 2010 | Rating ➦ ★★★★★★★ |
| Episode 17 - [The Precious Fragmentation] |
| Details : When the guys find a ring from The Lord of the Rings at a garage sale it threatens to tear them apart. |
| Guest Cast and Crew : Frank Maharajh as Venkatesh Koothrappali | Director : Mark Cendrowski | |
| Air Date : Mar. 08, 2010 | Rating ➦ ★★★★★★★ |
| Episode 18 - [The Pants Alternative] |
| Details : Sheldon's friends come to his aid when his fear of public speaking stands between him and a coveted award. |
| Air Date : Mar. 22, 2010 | Rating ➦ ★★★★★★★ |
| Episode 19 - [The Wheaton Recurrence] |
| Details : A fight between Leonard and Penny threatens their relationship while Sheldon battles Wil Wheaton in bowling. |
| Guest Cast and Crew : Wil Wheaton as Himself | Kevin Sussman as Stuart Bloom | |
| Air Date : Apr. 12, 2010 | Rating ➦ ★★★★★★ |
| Episode 20 - [The Spaghetti Catalyst] |
| Details : When Leonard and Penny aren't speaking Sheldon goes to extremes to keep them both happy. |
| Guest Cast and Crew : Writer : Chuck Lorre | Writer : Lee Aronsohn | Writer : Bill Prady | Director : Anthony Joseph Rich | |
| Air Date : May. 03, 2010 | Rating ➦ ★★★★★★★ |
| Episode 21 - [The Plimpton Stimulation] |
| Details : Leonard and Sheldon compete for the attention of a famous female physicist. |
| Guest Cast and Crew : Judy Greer as Elizabeth Plimpton | |
| Air Date : May. 10, 2010 | Rating ➦ ★★★★★★★ |
| Episode 22 - [The Staircase Implementation] |
| Details : Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator. |
| Guest Cast and Crew : Carol Ann Susi as Debbie Wolowitz (voice) | Ed Lieberman as Announcer (voice) | Ally Maki as Joyce Kim | Steven Yeun as Sebastian | Ajgie Kirkland as Louie | |
| Air Date : May. 17, 2010 | Rating ➦ ★★★★★★★★ |
| Episode 23 - [The Lunar Excitation] |
| Details : While Penny worries that dating Leonard has ruined her for normal guys Wolowitz and Koothrappali search for Sheldon's perfect match online. |
| Guest Cast and Crew : Sara Gilbert as Leslie Winkle | Lauri Johnson as Mrs. Gunderson | Brian Thomas Smith as Zack Johnson | Mayim Bialik as Amy Fowler | |
| Air Date : May. 24, 2010 | Rating ➦ ★★★★★★★ |