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Season 2

18 :02x01 - The Bad Fish Paradigm

Sep/22/2008
Leonard and Penny's date ends abruptly then she goes to Sheldon for advice and reveals a secret about herself which he has a hard time keeping.
Co-Guest Stars: Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski

19 :02x02 - The Codpiece Topology

Sep/29/2008
After Leonard sees Penny with a new guy, he hooks up with Leslie Winkle again but the relationship hits a snag when he supports one of Sheldon't scientific theories over hers.
Guest Stars: Travis Schuldt as Eric
Director: Mark Cendrowski
Story: Chuck Lorre | Teleplay: Lee Aronsohn, Bill Prady

20 :02x03 - The Barbarian Sublimation

Oct/06/2008
Introduced by Sheldon to a video game, Penny soon becomes addicted to playing it to the detriment of everything else in her life.
Guest Stars: Mark Harelik as Dr. Eric Gablehauser |
Co-Guest Stars: Tyler J. Olson as Blaine | Mark Hames as Tom
Director: Mark Cendrowski

21 :02x04 - The Griffin Equivalency

Oct/13/2008
Raj gets all full of himself after making a scientific discovery and receiving a subsequent award from People magazine.
Special Guest Stars: Charlie Sheen as Himself |
Guest Stars: Mark Harelik as Dr. Eric Gablehauser | Brian George (1) as Dr. Koothrappali | Alice Amter as Mrs. Koothrappali
Director: Mark Cendrowski

22 :02x05 - The Euclid Alternative

Oct/20/2008
The gang stages an intervention with Sheldon in order to force him to learn how to drive after their playing chauffeur for him begins imposing upon their time and driving them crazy.
Guest Stars: Octavia Spencer as Octavia |
Co-Guest Stars: Elena Campbell-Martinez as Maria | Livia Trevino as Lourdes
Director: Mark Cendrowski

23 :02x06 - The Cooper-Nowitzki Theorem

Nov/03/2008
A graduate student takes a liking to Sheldon and soon begins doing all his daily tasks. Our hero likes it at first but her devotion soon proves to be too much.
Guest Stars: Riki Lindhome as Ramona Nowitzki | Emily Happe as Kathy O'Brien
Director: Mark Cendrowski

24 :02x07 - The Panty PiƱata Polarization

Nov/10/2008
War breaks out between Penny and Sheldon when he banishes her from the apartment for touching his food. Meanwhile, Raj and Howard try to find the location of a house full of super models.
Co-Guest Stars: Analeigh Tipton as Analeigh | Samantha Potter as Model
Director: Mark Cendrowski

25 :02x08 - The Lizard-Spock Expansion

Nov/17/2008
Howard goes on a date with a woman but when she meets Leonard she quickly ditches Howard. This leads to tension between the two nerdy friends.
Guest Stars: Sara Rue as Dr. Stephanie Barnett | Carol Ann Susi as Mrs. Wolowitz |
Co-Guest Stars: Jennifer Hale as News Announcer | Robert Clotworthy as Announcer
Director: Mark Cendrowski

26 :02x09 - The White Asparagus Triangulation

Nov/24/2008
Sheldon wholeheartedly approves of Leonard's new relationship with Stephanie and takes steps to see that it continues.
Guest Stars: Sara Rue as Dr. Stephanie Barnett
Director: Mark Cendrowski

27 :02x10 - The Vartabedian Conundrum

Dec/08/2008
When Leonard decides that he wants to end his relationship with Stephanie he goes to Penny for advice on how to do so.
Guest Stars: Sara Rue as Dr. Stephanie Barnett
Director: Mark Cendrowski

28 :02x11 - The Bath Item Gift Hypothesis

Dec/15/2008
A handsome colleague of Leonard's asks Penny out on a date. Meanwhile, Sheldon struggles to come up with an appropriate Christmas gift for Penny.
Special Guest Stars: Michael Trucco as Dr. David Underhill |
Guest Stars: Michael Hyatt as Charlotte
Director: Mark Cendrowski

29 :02x12 - The Killer Robot Instability

Jan/12/2009
The guys build a killer robot and are challenged to a duel by a colleague at the university. Meanwhile, Penny lays down the law towards Howard regarding his behavior towards her which causes him to go into a deep depression.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | John Ross Bowie as Barry Kripke
Director: Mark Cendrowski

30 :02x13 - The Friendship Algorithm

Jan/19/2009
When Sheldon discovers that nemesis Kripke is in charge of access to the university's super computer he decides to befriend his badly lisping colleague in hopes of gaining access.
Guest Stars: John Ross Bowie as Barry Kripke |
Co-Guest Stars: Will Deutsch as Jeremy | Jane Galloway Heitz as Mildred | Jade Zdanow as Rebecca
Director: Mark Cendrowski

31 :02x14 - The Financial Permeability

Feb/02/2009
Sheldon lends Penny money when she is unable to pay her rent. Leonard then tries to discover why she is in such a financial bind and finds out it has to do with her hulking ex-boyfriend Kurt.
Guest Stars: Brian Patrick Wade as Kurt
Director: Mark Cendrowski

32 :02x15 - The Maternal Capacitance

Feb/09/2009
Leonard's mother arrrives for a visit and proceeds to drive him, Penny, Howard, and Raj crazy. Sheldon, however, finds her fascinating and the two get along extremely well.
Special Guest Stars: Christine Baranski as Dr. Beverly Hofstader
Director: Mark Cendrowski
Songs: Journey -- Any Way You Want It, Red Hot Chili Peppers -- Under The Bridge

33 :02x16 - The Cushion Saturation

Mar/02/2009
Penny panics when she accidentally shoots a paintball pellet onto the cushion in Sheldon's spot on the living room couch. Meanwhile, Howard begins a sexual relationship with Leslie Winkle.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski
Story: Chuck Lorre | Teleplay: Bill Prady, Lee Aronsohn

34 :02x17 - The Terminator Decoupling

Mar/09/2009
The guys travel on board a train to San Francisco for a symposium and discover that actress Summer Glau is also on board. Howard, Raj, and Leonard then develop plans to make time with her. Sheldon must rely on Penny's help after discovering that he left his flash drive behind.
Special Guest Stars: Summer Glau as Herself |
Co-Guest Stars: Dr. George Smoot as Himself | Robert Clotworthy as Conductor
Director: Mark Cendrowski

35 :02x18 - The Work Song Nanocluster

Mar/16/2009
Penny starts he own internet business but a caffeine addled Sheldon doesn't exactly help her make it into a success.
Director: Peter Chakos

36 :02x19 - The Dead Hooker Juxtaposition

Mar/30/2009
Penny get extremely jealous when a beautiful new girl moves into the apartment building and immediately has the guys at her beck and call doing favors.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Valerie Azlynn as Alicia
Director: Mark Cendrowski

37 :02x20 - The Hofstadter Isotope

Apr/13/2009
Stuart, the owner of the comic book store, gets Penny to go out on a date with him but it ends up getting ruined by Sheldon's interference. Meanwhile, Leonard, Howard, and Raj head for a single's bar to pick up women and one of them gets lucky.
Guest Stars: Kevin Sussman as Stuart |
Uncredited: Ian Scott Rudolph as Captain Sweatpants
Director: Mark Cendrowski

38 :02x21 - The Vegas Renormalization

Apr/27/2009
After Leslie Winkle breaks up with him, Raj and Leonard take Howard to Las Vegas in order to cheer him up. A prostitute they meet there named Mikayla might be just what Howard needs. Meanwhile, Sheldon, who has stayed behind, finds himself locked out of the apartment.
Guest Stars: Jodi Lyn O'Keefe as Mikayla
Director: Mark Cendrowski
Songs: Kaley Cuoco -- Soft Kitty

39 :02x22 - The Classified Materials Turbulence

May/04/2009
A second date between Penny and Stuart ends disastrously when she calls out Leonard's name during a make-out session. Meanwhile, Howard tries to fix a design flaw in a NASA space station toilet with some help from his friends.
Guest Stars: Kevin Sussman as Stuart |
Co-Guest Stars: Robert Clotworthy as Astronaut | Travis Davis as Ground Controller |
Uncredited: Ian Scott Rudolph as Captain Sweatpants
Director: Mark Cendrowski

40 :02x23 - The Monopolar Expedition

May/11/2009
When Sheldon is chosen by the university to lead a scientific expedition to the North Pole he persuades his reluctant friends to accompany him as members of his research team. When hearing the news, Penny is sad because she realizes that she will miss Leonard while he's gone.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Brian George (1) as Dr. Koothrappali | Alice Amter as Mrs. Koothrappali
Director: Mark Cendrowski
Classification: Scripted
Genre: Comedy
Status: Returning Series
Network: CBS ( USA)
Airs: Mondays at 08:00 pm
Runtime: 30 Minutes
Premiere: September 24, 2007
Episode Order: 24
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