Episodes cast for
"The Big Bang Theory" (2007) More at IMDbPro »

Season: 1 | 2 | 3
Year: 2007 | 2008 | 2009

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Season 1

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Season 1, Episode 1: Pilot

24 September 2007
A pair of brilliant theoretical physicists meet a woman who shows them how little they know about the real world.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Vernee Watson-Johnson	...	Althea (as Vernée Watson)
	Brian Wade	...	Kurt (as Brian Patrick Wade)
	Iris Bahr	...	Gilda (uncredited)
	Amanda Walsh	...	Katie (uncredited)

Season 1, Episode 2: The Big Bran Hypothesis

1 October 2007
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.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali

Season 1, Episode 3: The Fuzzy Boots Corollary

8 October 2007
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.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Sara Gilbert	...	Leslie Winkle
	Allen Nabors	...	Doug
	Treisa Gary	...	Waitress
	Sherry Weston	...	Instructor

Season 1, Episode 4: The Luminous Fish Effect

15 October 2007
Sheldon's Christian-fundamentalist mother visits to get him out of the funk he's in after he is fired for being disrespectful toward his new boss.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Laurie Metcalf	...	Mary
	Mark Harelik	...	Dr. Eric Gablehauser
	Sierra Edwards	...	Summer

Season 1, Episode 5: The Hamburger Postulate

22 October 2007
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.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Sara Gilbert	...	Leslie Winkle

Season 1, Episode 6: The Middle Earth Paradigm

29 October 2007
The guys are invited to Penny's Halloween costume party. During the party, Leonard has a run-in with Penny's ex-boyfriend.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Brian Wade	...	Kurt (as Brian Patrick Wade)
	Rachel Cannon	...	Patty
	Erin Allin O'Reilly	...	Cheryl
	Kimberly Kevon Williams	...	Vicki
	Cynthia Holloway	...	Roberta

Season 1, Episode 7: The Dumpling Paradox

5 November 2007
When Howard hooks up with Penny's old friend, it ruins the nights on which all of the guys play the game "Halo."

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Brooke D'Orsay	...	Christy
	James Hong	...	Chen
	Carol Ann Susi	...	Mrs. Wolowitz (voice)
	Kimberly Brooks	...	Automated Cell Phone Voice (voice) (as Kimberly D. Brooks)

Season 1, Episode 8: The Grasshopper Experiment

12 November 2007
Rajnesh's parents, communicating from India by Web cam, arrange for him to go out with another Indian woman in the hopes of marriage, but his date turns out to have more in common with Sheldon.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Sarayu Rao	...	Lalita Gupta
	Brian George	...	Dr. V.M. Koothrappali
	Alice Amter	...	Mrs. Koothrappali

Season 1, Episode 9: The Cooper-Hofstadter Polarization

17 March 2008
Leonard and Sheldon's friendship is put to the test when Leonard wants to present a paper they co-authored at a physics convention, but Sheldon does not.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Talbott Lin	...	Chinese Leonard
	Howard Chan	...	Chinese Sheldon

Season 1, Episode 10: The Loobenfeld Decay

24 March 2008
Leonard lies to Penny so that he and Sheldon can get out of watching her perform. However, Sheldon believes that the lie has too many loose ends, so he comes up with a new, unnecessarily complex one to replace it.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	DJ Qualls	...	Toby Loobenfeld (as D.J. Qualls)

Season 1, Episode 11: The Pancake Batter Anomaly

31 March 2008
Sheldon is sick, and Leonard and the guys sneak out to a "Planet of the Apes" movie marathon to get out of taking care of him--which leaves Penny as the only person to whom the needy Sheldon can turn.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Carol Ann Susi	...	Mrs. Wolowitz (voice)
	Erin Allin O'Reilly	...	Cheryl

Season 1, Episode 12: The Jerusalem Duality

14 April 2008
Sheldon is threatened when a new 15-year-old prodigy who is smarter than him joins the lab, so the guys come up with a plan to get rid of him.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Mark Harelik	...	Dr. Eric Gablehauser
	Austin Lee	...	Dennis Kim
	Emma Degerstedt	...	Emma
	Joel Brooks	...	Professor Goldfarb (uncredited)

Season 1, Episode 13: The Bat Jar Conjecture

21 April 2008
Sheldon becomes so intent on demonstrating his intellectual superiority over his Physics Bowl teammates that they boot him, and replace him with his nemesis.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Sara Gilbert	...	Leslie Winkle
	Mark Harelik	...	Dr. Eric Gablehauser
	Adam Gregor	...	Dmitri
	Sandra Marquez	...	Woman
	Sergio Enrique	...	Son

Season 1, Episode 14: The Nerdvana Annihilation

28 April 2008
Penny gets mad at Leonard because the guys' new "time machine" causes her to miss work. Leonard is so devastated that he vows to give up all of his nerd memorabilia.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Andrew W. Walker	...	Mike (as Andrew Walker)

Season 1, Episode 15: The Pork Chop Indeterminacy

5 May 2008
Sheldon's sexy twin sister arrives in town from Texas, and all of Sheldon's friends fight over who will get to be with her.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Courtney Henggeler	...	Missy

Season 1, Episode 16: The Peanut Reaction

12 May 2008
When Penny and the guys learn that Leonard has never had a birthday party, they decide to try to throw a surprise party for him.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Vernee Watson-Johnson	...	Althea (as Vernée Watson)
	Judith Moreland	...	Jan
	Ronald Hunter	...	Dan
	Chuck Carter	...	Stan

Season 1, Episode 17: The Tangerine Factor

19 May 2008
After Penny breaks up with her new guy, she agrees to go out on a date with Leonard. However, both of them have reservations about the date soon after agreeing to it.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	James Hong	...	Chen
	William Ngo	...	Chinese International Grad Student (uncredited)

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Season 2

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Season 2, Episode 1: The Bad Fish Paradigm

22 September 2008
Leonard is concerned when his date with Penny ends abruptly and she starts blowing him off. When told the truth, Sheldon would rather move out than keep Penny's reasons a secret from Leonard.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Carol Ann Susi	...	Mrs. Wolowitz

Season 2, Episode 2: The Codpiece Topology

29 September 2008
After seeing Penny with her new boyfriend, Leonard turns to Leslie for comfort. The move angers Sheldon, who considers Leslie his comic book-style "arch enemy."

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Sara Gilbert	...	Leslie Winkle
	Travis Schuldt	...	Eric

Season 2, Episode 3: The Barbarian Sublimation

6 October 2008
Sheldon turns Penny on to online gaming, and then she refuses to turn it off after becoming addicted.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Sara Gilbert	...	Leslie Winkle
	Mark Harelik	...	Dr. Eric Gablehauser
	Tyler J. Olson	...	Blaine (as Tyler Olson)
	Mark Hames	...	Tom

Season 2, Episode 4: The Griffin Equivalency

13 October 2008
After being featured in a People magazine article, Raj becomes full of himself and alienates his friends. However, his newfound fame does get him a date with Penny.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Charlie Sheen	...	Himself
	Mark Harelik	...	Dr. Eric Gablehauser
	Brian George	...	Dr. V.M. Koothrappali
	Alice Amter	...	Mrs. Koothrappali

Season 2, Episode 5: The Euclid Alternative

20 October 2008
The gang tries to teach Sheldon how to drive.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Octavia Spencer	...	Octavia
	Elena Campbell-Martinez	...	Maria
	Livia Treviño	...	Lourdes
	Jaime Soria	...	DMV Customer (uncredited)

Season 2, Episode 6: The Cooper-Nowitzki Theorem

3 November 2008
Sheldon becomes cozy with a female graduate student who is infatuated with him, but nobody can figure out whether they're in a relationship--including Sheldon.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Sara Gilbert	...	Leslie Winkle
	Riki Lindhome	...	Ramona Nowitzki
	Emily Happe	...	Kathy O'Brian

Season 2, Episode 7: The Panty Piñata Polarization

10 November 2008
Penny plans revenge when Sheldon bans her from the guys' apartment, while Howard and Rajesh use the latest technology to try to find the house being used in "America's Next Top Model."

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Analeigh Tipton	...	Analeigh
	Samantha Potter	...	Model

Season 2, Episode 8: The Lizard-Spock Expansion

17 November 2008
Howard and Leonard's friendship could be at an end when Leonard steals Howard's new woman from him.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Sara Rue	...	Stephanie
	Carol Ann Susi	...	Mrs. Wolowitz (voice)
	Jennifer Hale	...	News Announcer (voice)
	Robert Clotworthy	...	Announcer (voice)

Season 2, Episode 9: The White Asparagus Triangulation

24 November 2008
Sheldon tries to help move Leonard's new relationship along, because his track record with women has been less than successful. But will he cause more trouble than good?

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Sara Rue	...	Stephanie

Season 2, Episode 10: The Vartabedian Conundrum

8 December 2008
Leonard is the last one to realize that Stephanie has moved in with him. And when he finds out, he becomes worried that they are moving too fast

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Sara Rue	...	Stephanie Barnett

Season 2, Episode 11: The Bath Item Gift Hypothesis

15 December 2008
Much to Lenonard's disappointment, Penny suddenly develops an interest in science when a sexy new physicist joins the lab. Meanwhile, Sheldon struggles to find an appropriate Christmas gift for Penny.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Michael Trucco	...	Dr. David Underhill
	Michael Hyatt	...	Charlotte

Season 2, Episode 12: The Killer Robot Instability

12 January 2009
Howard becomes depressed after Penny makes a cruel statement about his love life, while the rest of the guys prepare for a grudge killer robot duel against an obnoxious colleague at the university.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Carol Ann Susi	...	Mrs. Wolowitz (voice)
	John Ross Bowie	...	Barry Kripke
	Chris Krauser	...	Club patron (uncredited)

Season 2, Episode 13: The Friendship Algorithm

19 January 2009
Sheldon tries to make friends with a despised colleague, with the hopes that it will get him access to a coveted computer in the lab.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	John Ross Bowie	...	Barry Kripke
	Will Deutsch	...	Jeremy
	Jane Galloway Heitz	...	Mildred
	Jade Zdanow	...	Rebecca
	Chris Krauser	...	Club Patron (uncredited)

Season 2, Episode 14: The Financial Permeability

2 February 2009
Penny cannot afford to pay her rent, so Sheldon and Leonard each come up with unique ways to help her out.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Brian Wade	...	Kurt (as Brian Patrick Wade)

Season 2, Episode 15: The Maternal Capacitance

9 February 2009
Sheldon hits it off with Leonard's psychoanalyst mother, but she drives Leonard and Penny to the bottle.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Christine Baranski	...	Beverly Hofstadter

Season 2, Episode 16: The Cushion Saturation

5 May 2009
Howard hooks up with Leslie, while Penny accidentally ruins Sheldon's spot on the couch.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Sara Gilbert	...	Leslie Winkle
	Carol Ann Susi	...	Mrs. Wolowitz (voice)

Season 2, Episode 17: The Terminator Decoupling

9 March 2009
On a train trip to San Francisco, the boys debate on how to meet sci-fi star Summer Glau, who is on board with them.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Summer Glau	...	Herself
	Dr. George Smoot	...	Himself
	Robert Clotworthy	...	Train Conductor (voice)
	Alan Mueting	...	Conference Attendee (uncredited)

Season 2, Episode 18: The Work Song Nanocluster

16 March 2009
Sheldon's assistance with Penny's home-based business leads to disaster.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali

Season 2, Episode 19: The Dead Hooker Juxtaposition

30 March 2009
Penny becomes jealous when a gorgeous new neighbor attracts the guys' attention.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Carol Ann Susi	...	Mrs. Wolowitz (voice)
	Valerie Azlynn	...	Alicia

Season 2, Episode 20: The Hofstadter Isotope

13 April 2009
Leonard is so upset when a friend from the comic book store begins dating Penny that he convinces Howard and Raj to take him to a bar so that he can pick up a woman of his own.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Kevin Sussman	...	Stuart

Season 2, Episode 21: The Vegas Renormalization

27 April 2009
After being dumped by Leslie, Howard heads to Las Vegas with Leonard and Raj, leaving Penny to deal with Sheldon, who has locked himself out of the apartment.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Jodi Lyn O'Keefe	...	Mikayla

Season 2, Episode 22: The Classified Materials Turbulence

4 May 2009
Penny's second date with Stuart has significant implications for Leonard. Howard enlists the guys' help with one of his NASA projects.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Kevin Sussman	...	Stuart
	Robert Clotworthy	...	Astronaut (voice)
	Travis Davis	...	Ground Controller (voice)

Season 2, Episode 23: The Monopolar Expedition

11 May 2009
Penny gets upset when she finds out Leonard and the guys plan to work at the North Pole for the summer.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Carol Ann Susi	...	Mrs. Wolowitz (voice)
	Brian George	...	Dr. V. M. Koothrappali
	Alice Amter	...	Mrs. Koothrappali

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Season 3

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Season 3, Episode 1: The Electric Can Opener Fluctuation

21 September 2009
After returning from the North Pole, a conflict among the guys sends Sheldon back to Texas and interferes with Leonard's reunion with Penny.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Laurie Metcalf	...	Mary
	John Ross Bowie	...	Barry Kripke

Season 3, Episode 2: The Jiminy Conjecture

28 September 2009
Leonard and Penny's first night together goes awkwardly. Sheldon and Howard wager on the species of a cricket.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Lewis Black	...	Professor Crawley

Season 3, Episode 3: The Gothowitz Deviation

5 October 2009
Sheldon attempts to covertly alter Penny's habits, while Howard and Raj try their luck meeting women at a Goth-style club.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Molly Morgan	...	Beth
	Sarah Buehler	...	Sarah
	Andy Mackenzie	...	Skeeter

Season 3, Episode 4: The Pirate Solution

12 October 2009
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.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Elizabeth Bogush	...	Dr. Catherine Millstone
	Elena Campbell-Martinez	...	Cleaning Lady
	Oliver Muirhead	...	Professor Laughlin

Season 3, Episode 5: The Creepy Candy Coating Corollary

19 October 2009
Wolowitz begs Penny to set him up with one of her friends; Sheldon seeks payback against Wil Wheaton at a trading-card show.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Matt Barr	...	Mike
	Melissa Rauch	...	Bernadette
	Ian Scott Rudolph	...	Captain Sweatpants
	Kevin Sussman	...	Stuart
	Wil Wheaton	...	Himself

Season 3, Episode 6: The Cornhusker Vortex

2 November 2009
To blend in better with several of Penny's friends from back home, Leonard learns about football...from Sheldon. Meanwhile, a loss in a kite war threatens to end Raj and Howard's friendship.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Zachary Abel	...	Todd
	Jason Mesches	...	Denny

Season 3, Episode 7: The Guitarist Amplification

9 November 2009
Sheldon is forced to play peacemaker when Leonard and Penny have an argument, mainly because their fighting is bringing back repressed childhood memories.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Alice Amter	...	Mrs. Koothrappali
	Brian George	...	Dr. V. M. Koothrappali
	Carol Ann Susi	...	Mrs. Wolowitz (voice)
	Kevin Sussman	...	Stuart
	C.J. Thomason	...	Jesse

Season 3, Episode 8: The Adhesive Duck Deficiency

16 November 2009
With Leonard, Howard and Raj away camping in the desert, an injured Penny has only Sheldon to rely on.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	Amber Borycki	...	Robyn

Season 3, Episode 9: The Vengeance Formulation

23 November 2009
Sheldon vows payback after Kripke humiliates him on the radio. Howard gets advice concerning his relationship with Bernadette...from "Battlestar Galactica's" Katee Sackhoff.

	Johnny Galecki	...	Leonard Hofstadter
	Jim Parsons	...	Sheldon Cooper
	Kaley Cuoco	...	Penny
	Simon Helberg	...	Howard Wolowitz
	Kunal Nayyar	...	Rajesh Koothrappali
	John Ross Bowie	...	Barry Kripke
	Ira Flatow	...	Himself
	Melissa Rauch	...	Bernadette
	Katee Sackhoff	...	Herself
	Carol Ann Susi	...	Mrs. Wolowitz