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(Change Layout)The Big Bang Theory  
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« Season 1   Settings    Season 2 (Printable Guide) Season 3 »
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Season 2
18 :02x01 - The Bad Fish Paradigm (Sep/22/2008)
Penny and Leonard go on a date, but when their night out goes awry, Penny finds a friend in Sheldon.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski
Story: Bill Prady | Teleplay: David Goetsch, Steven Molaro
 
19 :02x02 - The Codpiece Topology (Sep/29/2008)
Leonard begins dating Sheldon's nemesis, Leslie Winkle, after seeing Penny with a handsome new guy.
Guest Stars: Travis Schuldt as Eric
Director: Mark Cendrowski
Story: Lee Aronsohn, Chuck Lorre | Teleplay: Bill Prady
 
20 :02x03 - The Barbarian Sublimation (Oct/06/2008)
Penny is introduced to online gaming by Sheldon, and she quickly becomes addicted.
Guest Stars: Mark Hames as Tom, Tyler J. Olson as Blaine, Mark Harelik as Dr. Eric Gablehauser
Director: Mark Cendrowski
Story: Nicole Lorre | Teleplay: Steven Molaro, Eric Kaplan
 
21 :02x04 - The Griffin Equivalency (Oct/13/2008)
Raj gets a swelled head and goes after Leonard's new crush, Penny, after being made famous in a magazine article leading to a disastrous result.
Guest Stars: Mark Harelik as Dr. Eric Gablehauser, | Uncredited: Charlie Sheen as Himself
Director: Mark Cendrowski
Story: Bill Prady, Chuck Lorre | Teleplay: Stephen Engel, Tim Doyle (1)
 
22 :02x05 - The Euclid Alternative (Oct/20/2008)
Leonard and his friends want to help Sheldon overcome his fear of driving with an intervention.
Guest Stars: Octavia Spencer as Octavia, Elena Campbell-Martinez as Maria, Livia Trevino as Lourdes
Director: Mark Cendrowski
Story: Bill Prady, Steven Molaro | Teleplay: David Goetsch, Lee Aronsohn
 
23 :02x06 - The Cooper-Nowitzki Theorem (Nov/03/2008)
Sheldon, as well as the others, are baffled when a young grad student begins to fall for him.
Guest Stars: Emily Happe as Kathy, Riki Lindhome as Ramona
Director: Mark Cendrowski
Story: Daley Haggar, Stephen Engel | Teleplay: Richard Rosenstock, Tim Doyle (1)
 
24 :02x07 - The Panty Piñata Polarization (Nov/10/2008)
After Sheldon bans Penny from the apartment for what she feels are minor infractions, she declares and all-out war on him.
Guest Stars: Analeigh Tipton as Analeigh
Director: Mark Cendrowski
Story: Bill Prady, Tim Doyle (1) | Teleplay: Jennifer Glickman, Steven Molaro
 
25 :02x08 - The Lizard-Spock Expansion (Nov/17/2008)
Has a smitten Wolowitz found the love of his life, he thinks so until she meets Leonard.
Guest Stars: Sara Rue as Stephanie, Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski
Writer: David Goetsch, Jennifer Glickman
Story: Bill Prady
 
26 :02x09 - The White Asparagus Triangulation (Nov/24/2008)
Sheldon puts all his efforts to make Leonard's relationship with Stephanie, work.
Guest Stars: Sara Rue as Stephanie
Director: Mark Cendrowski
Story: Steven Molaro | Teleplay: Richard Rosenstock, Stephen Engel
 
27 :02x10 - The Vartabedian Conundrum (Dec/08/2008)
Leonard ask for advice from Penny when his relationship with Stephanie begins moving too fast for him.
Guest Stars: Sara Rue as Stephanie
Director: Mark Cendrowski
Story: Chuck Lorre, Steven Molaro | Teleplay: Bill Prady, Richard Rosenstock
 
28 :02x11 - The Bath Item Gift Hypothesis (Dec/15/2008)
Leonard finds no comfort and joy at Christmas time, as his colleague begins dating Penny. Meanwhile, Sheldon's adherence to gift-giving etiquette is driving everyone nuts.
Guest Stars: Michael Hyatt (1) as Charlotte, Michael Trucco as David Underhill
Director: Mark Cendrowski
Story: Richard Rosenstock, Bill Prady | Teleplay: Stephen Engel, Eric Kaplan
 
29 :02x12 - The Killer Robot Instability (Jan/12/2009)
Wolowitz leaves his friends in a bind when he drops out of an upcoming robot competition after becoming depressed when due to Penny's comment on his love life.
Guest Stars: John Ross Bowie as Barry Kripke, Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski
Story: Richard Rosenstock, Bill Prady | Teleplay: Steven Molaro, Daley Haggar
 
30 :02x13 - The Friendship Algorithm (Jan/19/2009)
The boys discover a conundrum which is baffling: The very source of Sheldon's social awkwardness seems to be his intelligence, is also the reason according to his new scientific procedure for making friends.
Guest Stars: John Ross Bowie as Barry Kripke, Jane Galloway Heitz (1) as Mildred, Will Deutsch as Jeremy, Jade Zdanow as Rebecca
Director: Mark Cendrowski
Story: Richard Rosenstock, Bill Prady | Teleplay: Steven Molaro, Chuck Lorre
 
31 :02x14 - The Financial Permeability (Feb/02/2009)
Penny receives help from Sheldon over her financial crisis, but causes Penny's burly ex-boyfriend, Kurt, to be confronted by Leonard.
Guest Stars: Brian Patrick Wade (1) as Kurt
Director: Mark Cendrowski
Story: Steven Molaro, Chuck Lorre | Teleplay: Richard Rosenstock, Eric Kaplan
 
32 :02x15 - The Maternal Capacitance (Feb/09/2009)
Penny and Leonard turn to each other and tequila for comfort after suffering a dreadful visit from his mother.
Guest Stars: Christine Baranski as Beverly
Director: Mark Cendrowski
Story: Bill Prady, Chuck Lorre | Teleplay: Steven Molaro, Richard Rosenstock
 
33 :02x16 - The Cushion Saturation (Mar/02/2009)
A paintball game sparks a fight between Penny and Sheldon, and leads to romance for Wolowitz and Leslie.
Guest Stars: Sara Gilbert as Leslie Winkle
Director: Mark Cendrowski
Story: Chuck Lorre | Teleplay: Bill Prady, Lee Aronsohn
 
34 :02x17 - The Terminator Decoupling (Mar/09/2009)
Leonard, Sheldon, Wolowitz and Raj take a train trip to San Francisco and can hardly believe beautiful sci-fi actress Summer Glau is onboard.
Guest Stars: Dr. George Smoot as Himself, Summer Glau as Herself
Director: Mark Cendrowski
Story: Bill Prady, David Goetsch | Teleplay: Stephen Engel, Tim Doyle (1)
 
35 :02x18 - The Work Song Nanocluster (Mar/16/2009)
When Penny's friends, especially Sheldon, get involved in her new hair product business, it quickly suffers.
Director: Mark Cendrowski
Story: Lee Aronsohn, Bill Prady | Teleplay: David Goetsch, Richard Rosenstock
 
36 :02x19 - The Dead Hooker Juxtaposition (Mar/30/2009)
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
Guest Stars: Carol Ann Susi as Mrs. Wolowitz, Valerie Azlynn as Alicia
Director: Mark Cendrowski
Writer: Steven Molaro
 
37 :02x20 - The Hofstadter Isotope (Apr/13/2009)
While at a comic book store, Penny is romanced by a friend of the guys'. Meanwhile, Leonard and Wolowitz head to a bar for ladies night in hope of finding women.
Guest Stars: Kevin Sussman as Stuart
Director: Mark Cendrowski
Writer: David Goetsch
 
38 :02x21 - The Vegas Renormalization (Apr/27/2009)
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
Guest Stars: Jodi Lyn O'Keefe as Mikayla
Director: Mark Cendrowski
Story: Nicole Lorre, Andrea Roth | Teleplay: Steven Molaro
 
39 :02x22 - The Classified Materials Turbulence (May/04/2009)
Penny makes an unexpected discovery concerning Leonard, while on a date with Stuart. Meanwhile, a design flaw in his NASA project finds Wolowitz needing some help from his friends.
Guest Stars: Kevin Sussman as Stuart
Director: Mark Cendrowski
Story: Lee Aronsohn, Chuck Lorre | Teleplay: Bill Prady, Steven Molaro
 
40 :02x23 - The Monopolar Expedition (May/11/2009)
Leonard and Penny come to terms with their feelings for each other, as Leonard prepares himself for a three-month long science trip.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz, Brian George (2) as Dr. Koothrappali, Alice Amter as Mrs. Koothrappali
Director: Mark Cendrowski
Writer: Richard Rosenstock, Eric Kaplan
 
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