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| The Big Bang Theory Season 2 : |
| This season Leonard gets a girl. So does Sheldon. Howard drives the Mars Rover into a ditch. Raj woos a terminator. Gorgeous girl-next-door Penny falls under the spell of Age of Conan. And super-smart ueberconfident Leslie Winkler reduces mere men to spineless jellyfish. |
| Episode 1 - [The Bad Fish Paradigm] |
| Details : Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant. |
| Guest Cast and Crew : Carol Ann Susi as Debbie Wolowitz (voice) | |
| Air Date : Sep. 22, 2008 | Rating ➦ ★★★★★★★ |
| Episode 2 - [The Codpiece Topology] |
| Details : A jealous Leonard reacts to Penny's new guy by rebounding with Leslie. |
| Guest Cast and Crew : Travis Schuldt as Eric | Sara Gilbert as Leslie Winkle | |
| Air Date : Sep. 29, 2008 | Rating ➦ ★★★★★★★ |
| Episode 3 - [The Barbarian Sublimation] |
| Details : Sheldon creates a monster when he introduces Penny to online gaming. |
| Guest Cast and Crew : Sara Gilbert as Leslie Winkle | Mark Harelik as Eric Gablehauser | Tyler Jon Olson as Blaine | Mark Hames as Tom | |
| Air Date : Oct. 06, 2008 | Rating ➦ ★★★★★★★ |
| Episode 4 - [The Griffin Equivalency] |
| Details : Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article. |
| Guest Cast and Crew : Alice Amter as Mrs. Koothrappali | Mark Harelik as Eric Gablehauser | Charlie Sheen as Himself | Brian George as V.M. Koothrappali | |
| Air Date : Oct. 13, 2008 | Rating ➦ ★★★★★★★ |
| Episode 5 - [The Euclid Alternative] |
| Details : Leonard and his friends stage an intervention to force Sheldon to face his fear of driving. |
| Guest Cast and Crew : Octavia Spencer as Octavia | Elena Campbell-Martinez as Maria | Livia Treviņo as Lourdes | |
| Air Date : Oct. 20, 2008 | Rating ➦ ★★★★★★★ |
| Episode 6 - [The Cooper-Nowitzki Theorem] |
| Details : Sheldon and the gang are confused when a young grad student is attracted to him. |
| Guest Cast and Crew : Sara Gilbert as Leslie Winkle | Riki Lindhome as Ramona Nowitzki | Emily Happe as Kathy O'Brien | |
| Air Date : Nov. 03, 2008 | Rating ➦ ★★★★★★★ |
| Episode 7 - [The Panty Piņata Polarization] |
| Details : When Sheldon bans Penny from the apartment for numerous minor infractions she decides to retaliate. |
| Guest Cast and Crew : Analeigh Tipton as Herself | Samantha Potter as Herself | |
| Air Date : Nov. 10, 2008 | Rating ➦ ★★★★★★★ |
| Episode 8 - [The Lizard-Spock Expansion] |
| Details : Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life. |
| Guest Cast and Crew : Carol Ann Susi as Debbie Wolowitz (voice) | Robert Clotworthy as Announcer (voice) | Sara Rue as Stephanie Barnett | Jennifer Hale as News Announcer (voice) | |
| Air Date : Nov. 17, 2008 | Rating ➦ ★★★★★★ |
| Episode 9 - [The White Asparagus Triangulation] |
| Details : Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards. |
| Guest Cast and Crew : Sara Rue as Stephanie Barnett | |
| Air Date : Nov. 24, 2008 | Rating ➦ ★★★★★★ |
| Episode 10 - [The Vartabedian Conundrum] |
| Details : Leonard asks Penny for advice when his new relationship starts moving too fast. |
| Guest Cast and Crew : Sara Rue as Stephanie Barnett | |
| Air Date : Dec. 08, 2008 | Rating ➦ ★★★★★★ |
| Episode 11 - [The Bath Item Gift Hypothesis] |
| Details : Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette. |
| Guest Cast and Crew : Michael Trucco as David Underhill | Michael Hyatt as Charlotte | |
| Air Date : Dec. 15, 2008 | Rating ➦ ★★★★★★★★ |
| Episode 12 - [The Killer Robot Instability] |
| Details : Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the rest of guys are depending on him for. |
| Guest Cast and Crew : Carol Ann Susi as Debbie Wolowitz (voice) | John Ross Bowie as Barry Kripke | |
| Air Date : Jan. 12, 2009 | Rating ➦ ★★★★★★★ |
| Episode 13 - [The Friendship Algorithm] |
| Details : Sheldon creates a scientific procedure for making friends. |
| Guest Cast and Crew : Will Deutsch as Jeremy | Jane Galloway Heitz as Mildred | John Ross Bowie as Barry Kripke | Jade Zdanow as Rebecca | |
| Air Date : Jan. 19, 2009 | Rating ➦ ★★★★★★★ |
| Episode 14 - [The Financial Permeability] |
| Details : Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend. |
| Guest Cast and Crew : Brian Patrick Wade as Kurt | |
| Air Date : Feb. 02, 2009 | Rating ➦ ★★★★★★ |
| Episode 15 - [The Maternal Capacitance] |
| Details : Leonard and Penny are drawn together after a disastrous visit from Leonard's mother. |
| Guest Cast and Crew : Christine Baranski as Beverly Hofstadter | |
| Air Date : Feb. 09, 2009 | Rating ➦ ★★★★★★★★ |
| Episode 16 - [The Cushion Saturation] |
| Details : A paintball game leads to a fight between Sheldon and Penny and romance for Leslie and Wolowitz. |
| Guest Cast and Crew : Sara Gilbert as Leslie Winkle | Carol Ann Susi as Debbie Wolowitz (voice) | |
| Air Date : Mar. 02, 2009 | Rating ➦ ★★★★★★★ |
| Episode 17 - [The Terminator Decoupling] |
| Details : Leonard Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is on board the train they are taking to San Francisco. |
| Guest Cast and Crew : Summer Glau as Herself | Robert Clotworthy as Train Conductor (voice) | George F. Smoot as Himself | |
| Air Date : Mar. 09, 2009 | Rating ➦ ★★★★★★★ |
| Episode 18 - [The Work Song Nanocluster] |
| Details : Penny's home business turns into a complete nightmare when Sheldon takes over. |
| Air Date : Mar. 16, 2009 | Rating ➦ ★★★★★★★ |
| Episode 19 - [The Dead Hooker Juxtaposition] |
| Details : Penny squares off with a new beautiful female neighbor who may become the building's new Penny. |
| Guest Cast and Crew : Valerie Azlynn as Alicia | Carol Ann Susi as Debbie Wolowitz (voice) | Director : Mark Cendrowski | Writer : Steven Molaro | |
| Air Date : Mar. 30, 2009 | Rating ➦ ★★★★★★★ |
| Episode 20 - [The Hofstadter Isotope] |
| Details : A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night. |
| Guest Cast and Crew : Kevin Sussman as Stuart Bloom | Director : Mark Cendrowski | Writer : David Goetsch | |
| Air Date : Apr. 13, 2009 | Rating ➦ ★★★★★★★ |
| Episode 21 - [The Vegas Renormalization] |
| Details : Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas and Sheldon becomes locked out of his apartment and must stay with Penny. |
| Guest Cast and Crew : Jodi Lyn O'Keefe as Mikayla | |
| Air Date : Apr. 27, 2009 | Rating ➦ ★★★★★★★ |
| Episode 22 - [The Classified Materials Turbulence] |
| Details : Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her. Wolowitz realizes there's a crucial error in a NASA project he's working on. |
| Guest Cast and Crew : Travis Davis as Ground Controller (voice) | Kevin Sussman as Stuart Bloom | |
| Air Date : May. 04, 2009 | Rating ➦ ★★★★★★★ |
| Episode 23 - [The Monopolar Expedition] |
| Details : The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard. |
| Guest Cast and Crew : Alice Amter as Mrs. Koothrappali | Carol Ann Susi as Debbie Wolowitz (voice) | Brian George as V.M. Koothrappali | Writer : Eric Kaplan | |
| Air Date : May. 11, 2009 | Rating ➦ ★★★★★★★ |