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Season 3

41 :03x01 - The Electric Can Opener Fluctuation

Sep/21/2009
The guys return from the North Pole but when Sheldon finds out that they tampered with the results of his experiment there he leaves for Texas in disgrace. Going to Texas to bring him back prevents Leonard from hooking up with Penny.
Special Guest Stars: Laurie Metcalf as Mary Cooper |
Guest Stars: John Ross Bowie as Barry Kripke
Director: Mark Cendrowski
Songs: Kaley Cuoco -- Soft Kitty

42 :03x02 - The Jiminy Conjecture

Sep/28/2009
Leonard and Penny's first night together is awkward. Howard and Sheldon have a major dispute over the species of a cricket found in the apartment.
Special Guest Stars: Lewis Black as Professor Crawley
Director: Mark Cendrowski
Writer: Jim Reynolds

43 :03x03 - The Gothowitz Deviation

Oct/05/2009
Sheldon discovers a way to get Penny to "behave" better while Howard and Raj dress as Goths and head to a Gothic nightclub in order to pickup women.
Guest Stars: Molly Morgan as Bethany | Sarah Buehler as Sarah | Andy MacKenzie as Skeeter
Director: Mark Cendrowski
Songs: Shania Twain -- Man! I Feel Like A Woman

44 :03x04 - The Pirate Solution

Oct/12/2009
Raj's work visa is up and his research has come to a screeching halt. The only way he can avoid returning to India is to take a job working for Sheldon.
Guest Stars: Elizabeth Bogush as Dr. Catherine Millstone | Oliver Muirhead as Professor Laughlin |
Uncredited: Elena Campbell-Martinez as Cleaning Lady
Director: Mark Cendrowski
Songs: Survivor -- Eye Of The Tiger

45 :03x05 - The Creepy Candy Coating Corollary

Oct/19/2009
Howard gets Leonard and Penny to set him up with one of her co-workers at the Cheesecake Factory and the double date goes surprisingly well. Meanwhile, Sheldon has a showdown at a card game tournament with nemesis Wil Wheaton.
Special Guest Stars: Wil Wheaton as Himself |
Guest Stars: Kevin Sussman as Stuart | Melissa Rauch as Bernadette Rostenkowski |
Uncredited: Owen Thayer as Lonely Larry | Ian Scott Rudolph as Captain Sweatpants
Director: Mark Cendrowski

46 :03x06 - The Cornhusker Vortex

Nov/02/2009
Seeking to learn more about football in order to impress some of Penny's friends Leonard seeks assistance from an unlikely source--Sheldon.
Guest Stars: Zachary Abel as Todd |
Co-Guest Stars: Jason Mesches as Denny
Director: Mark Cendrowski

47 :03x07 - The Guitarist Amplification

Nov/09/2009
The relationship between Leonard and Penny hits its first bump when they have an argument about an old musician friend of hers from Omaha who's arriving in town and wants to sleep on her couch. Sheldon, who hates controversy and arguments, tries to play the peacemaker.
Guest Stars: Kevin Sussman as Stuart | Carol Ann Susi as Mrs. Wolowitz | Brian George (1) as Dr. Koothrappali | Alice Amter as Mrs. Koothrappali
Director: Mark Cendrowski

48 :03x08 - The Adhesive Duck Deficiency

Nov/16/2009
When Leonard, Raj, and Sheldon head out to the desert to watch a meteor shower, Sheldon is looking forward to a night alone but must come to Penny's aid when she falls in the shower and dislocates her shoulder. Meanwhile, out in the desert, hilarity ensues when they guys consume some drug laced brownies.
Director: Mark Cendrowski
Songs: Kaley Cuoco, Jim Parsons -- Soft Kitty

49 :03x09 - The Vengeance Formulation

Nov/23/2009
When Kripke pranks Sheldon during his appearance on National Public Radio our hero is determined to seek an exquisite revenge. Meanwhile, Howard begins to have second thoughts about his relationship with Bernadette.
Special Guest Stars: Katee Sackhoff as Herself |
Guest Stars: John Ross Bowie as Barry Kripke | Carol Ann Susi as Mrs. Wolowitz | Melissa Rauch as Bernadette Rostenkowski |
Co-Guest Stars: Ira Flatow as Himself
Director: Mark Cendrowski
Songs: Simon Helberg -- Bernadette

50 :03x10 - The Gorilla Experiment

Dec/07/2009
Trying to learn more about Leonard's job, Penny approaches Sheldon to teach her more about physics. Howard becomes jealous with Bernadette and Leonard start getting along.
Guest Stars: Melissa Rauch as Bernadette Rostenkowski | Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski

51 :03x11 - The Maternal Congruence

Dec/14/2009
Leonard's mother pays him another visit to his and Penny's consternation and Sheldon's delight.
Special Guest Stars: Christine Baranski as Dr. Beverly Hofstadter
Director: Mark Cendrowski

52 :03x12 - The Psychic Vortex

Jan/11/2010
Leonard and Penny have an argument when he discovers that she believes in psychics while Sheldon and Raj meet two girls at a university mixer and invite them back to the apartment.
Guest Stars: Melissa Rauch as Bernadette Rostenkowski | Danica McKellar as Abby | Jen Drohan as Martha |
Co-Guest Stars: David Trice as Waiter
Director: Mark Cendrowski
Songs: The Guess Who -- American Woman

53 :03x13 - The Bozeman Reaction

Jan/18/2010
Leonard and Sheldon return home one night to discover that their apartment has been robbed and ransacked. This causes Sheldon to come unglued and make a decision to move to Bozeman, Montana.
Guest Stars: Julio Oscar Mechoso as Officer Hackett |
Co-Guest Stars: Artie O'Daly as Young Man
Director: Mark Cendrowski

54 :03x14 - The Einstein Approximation

Feb/01/2010
After getting stumped by a difficult physics problem, Sheldon cracks up and eventually goes to work with Penny at the Cheesecake Factory in order to find a solution.
Guest Stars: Melissa Rauch as Bernadette Rostenkowski | Yeardley Smith as Sandy |
Co-Guest Stars: Kevin Brief as Glen
Director: Mark Cendrowski
Songs: Murray Head -- One Night in Bangkok

55 :03x15 - The Large Hadron Collision

Feb/08/2010
After being invited to Switzerland to see the CERN Supercollider, Leonard wants Penny to join him and make it a romantic Valentine's Day getaway. Sheldon then tries to do anything to take Penny's place. But what will Leonard do when both get sick?
Director: Mark Cendrowski

56 :03x16 - The Excelsior Acquisition

Mar/01/2010
Ruining his one and only chance at meeting Stan Lee, Sheldon winds up in traffic court because of illegal driving that he did when he drove Penny to the hospital (episode 308). However, as Leonard, Howard and Raj are all going to see Stan Lee, Penny is Sheldon's only hope of avoiding jail.
Special Guest Stars: Stan Lee as Himself |
Guest Stars: Kevin Sussman as Stuart | Steve Paymer as Judge Kirby |
Co-Guest Stars: Marcus Folmar as Guard |
Uncredited: Ian Scott Rudolph as Captain Sweatpants
Director: Peter Chakos

57 :03x17 - The Precious Fragmentation

Mar/08/2010
The guys buy a box of junk at a garage sale and find something precious inside, a prop ring from The Lord of the Rings that causes friend to go against friend.
Guest Stars: Frank Maharajh as Venkatesh
Director: Mark Cendrowski

58 :03x18 - The Pants Alternative

Mar/22/2010
Sheldon wins an award and is reluctant to accept it since he must give a speech before a large crowd. Each of his friends tries to help in his/her own way.
Director: Mark Cendrowski
Songs: Jim Parsons -- The Element Song

59 :03x19 - The Wheaton Recurrence

Apr/12/2010
Leonard's relationship with Penny hits rocky water after he utters the "L" word. The guys take on a team led by Wil Wheaton in a bowling tournament.
Special Guest Stars: Wil Wheaton as Himself |
Guest Stars: Kevin Sussman as Stuart |
Uncredited: Ian Scott Rudolph as Captain Sweatpants | Owen Thayer as Lonely Larry
Director: Mark Cendrowski

60 :03x20 - The Spaghetti Catalyst

May/03/2010
With Leonard and Penny now split-up, Sheldon becomes the peacemaker.
Director: Anthony Rich

61 :03x21 - The Plimpton Stimulation

May/10/2010
Sheldon has a famous female physicist friend stay with he and Leonard and becomes upset when Leonard and his friend become intimate.
Guest Stars: Judy Greer as Dr. Elizabeth Plimpton
Director: Mark Cendrowski

62 :03x22 - The Staircase Implementation

May/17/2010
Leonard and Sheldon's argument leads to Leonard sleeping on Penny's couch and relating how he met Sheldon. The story of the broken elevator also is revealed.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Ally Maki as Joyce Kim |
Co-Guest Stars: Steven Yeun as Sebastian | Ajgie Kirkland as Louie | Edward Lieberman as Announcer (as Ed Lieberman)
Director: Mark Cendrowski

63 :03x23 - The Lunar Excitation

May/24/2010
Penny realizes that after dating Leonard, she can no longer put up with the guys of limited intelligence that guys she normally dates. Howard and Raj try to find Sheldon a date on the Internet.
Special Guest Stars: Sara Gilbert as Leslie Winkle |
Guest Stars: Mayim Bialik as Amy Farrah Fowler | Brian Thomas Smith as Zack |
Co-Guest Stars: Lauri Johnson as Mrs. Gunderson
Director: Peter Chakos
Warning: The Big Bang Theory guide may contain spoilers
Classification: Scripted
Genre: Comedy
Status: Returning Series
Network: CBS ( USA)
Airs: Thursdays at 08:00 pm
Runtime: 30 Minutes
Premiere: September 24, 2007
Episode Order: 24
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