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| The Big Bang Theory Season 5 : |
| In season five Penny and Leonard's relationship is relaunched in full beta test mode while Sheldon Howard and Raj discover the feminine mystique is something that cannot be easily graphed or calculated. As Sheldon makes begrudging amendments to his Relationship Agreement with his friend-who-happens-to-be-a-girl Amy Farrah Fowler Raj contemplates an arranged marriage and Howard is all-systems-go for both is NASA space launch and wedding to the spirited Bernadette. |
| Episode 1 - [The Skank Reflex Analysis] |
| Details : Penny is worried with how damaged her friendship with the guys will be in the aftermath of her sleeping with Raj while Sheldon becomes the leader of the paintball team. |
| Guest Cast and Crew : Stacey Travis as Sandy | Christine Baranski as Beverly Hofstadter | |
| Air Date : Sep. 22, 2011 | Rating ➦ ★★★★★★★ |
| Episode 2 - [The Infestation Hypothesis] |
| Details : A fight between Sheldon and Penny leaves Amy caught in the middle while Leonard tries to spice up his long-distance relationship with Priya. |
| Guest Cast and Crew : Alice Amter as Mrs. Koothrappali | Aarti Mann as Priya Koothrappali | Brian George as V.M. Koothrappali | |
| Air Date : Sep. 22, 2011 | Rating ➦ ★★★★★★★ |
| Episode 3 - [The Pulled Groin Extrapolation] |
| Details : Leonard and Amy get to know each other better while Howard and Bernadette spend the weekend with Mrs. Wolowitz. |
| Guest Cast and Crew : Carol Ann Susi as Debbie Wolowitz (voice) | |
| Air Date : Sep. 29, 2011 | Rating ➦ ★★★★★★ |
| Episode 4 - [The Wiggly Finger Catalyst] |
| Details : Penny plays Matchmaker for Raj which results in him finding a girl he is comfortable talking to. |
| Guest Cast and Crew : Alice Amter as Mrs. Koothrappali | Katie Leclerc as Emily | Brian George as V.M. Koothrappali | |
| Air Date : Oct. 06, 2011 | Rating ➦ ★★★★★★ |
| Episode 5 - [The Russian Rocket Reaction] |
| Details : Sheldon and Leonard get invited to a party at Wil Wheaton's house and Howard gets an out-of-this-world opportunity. |
| Guest Cast and Crew : Carol Ann Susi as Debbie Wolowitz (voice) | Wil Wheaton as Himself | Kevin Sussman as Stuart Bloom | |
| Air Date : Oct. 13, 2011 | Rating ➦ ★★★★★★★ |
| Episode 6 - [The Rhinitis Revelation] |
| Details : Sheldon's mother Mary Cooper comes to visit but Sheldon is annoyed that she also spends time with the rest of the gang instead of catering to his every demand. |
| Guest Cast and Crew : Laurie Metcalf as Mary Cooper | |
| Air Date : Oct. 20, 2011 | Rating ➦ ★★★★★★★ |
| Episode 7 - [The Good Guy Fluctuation] |
| Details : A cute comic book artist puts Leonard and Priya’s relationship to the test while Sheldon tries to scare the guys for Halloween. |
| Guest Cast and Crew : Courtney Ford as Alice | Aarti Mann as Priya Koothrappali | Kevin Sussman as Stuart Bloom | |
| Air Date : Oct. 27, 2011 | Rating ➦ ★★★★★★★ |
| Episode 8 - [The Isolation Permutation] |
| Details : Amy becomes heartbroken when she discovers that Penny and Bernadette went wedding dress shopping without her. |
| Air Date : Nov. 03, 2011 | Rating ➦ ★★★★★★★ |
| Episode 9 - [The Ornithophobia Diffusion] |
| Details : Leonard and Penny try hanging out as friends on a 'non-date' but end up purposely ruining each others chances with perspective dates. Meanwhile Sheldon enlists the help of Bernadette and Amy to overcome his fear of birds. |
| Guest Cast and Crew : Blake Berris as Kevin | Ashley Austin Morris as Laura | |
| Air Date : Nov. 10, 2011 | Rating ➦ ★★★★★★ |
| Episode 10 - [The Flaming Spittoon Acquisition] |
| Details : When Stuart asks Amy out on a date Sheldon must confront his feelings and consider where his relationship with Amy is going. |
| Guest Cast and Crew : Josh Brener as Dale | Kevin Sussman as Stuart Bloom | |
| Air Date : Nov. 17, 2011 | Rating ➦ ★★★★★★ |
| Episode 11 - [The Speckerman Recurrence] |
| Details : Leonard must face his fears after being contacted by his high school tormentor. |
| Guest Cast and Crew : Lance Barber as Jimmy Speckerman | |
| Air Date : Dec. 08, 2011 | Rating ➦ ★★★★★★ |
| Episode 12 - [The Shiny Trinket Maneuver] |
| Details : Sheldon gets in trouble with Amy when he isn't impressed by her recent accomplishment and Howard must come to grips with Bernadette's dislike of children. |
| Guest Cast and Crew : Carol Ann Susi as Debbie Wolowitz (voice) | Jonathan Schmock as Jonathan | Jadon Sand as Aaron | Dusan Brown as Jeremy | |
| Air Date : Jan. 12, 2012 | Rating ➦ ★★★★★★ |
| Episode 13 - [The Recombination Hypothesis] |
| Details : Leonard who broke up with Priya asks Penny out to a spur-of the-moment romantic dinner for two and the duo contemplates on their relationship. |
| Guest Cast and Crew : Jim Turner as Reverend White | |
| Air Date : Jan. 19, 2012 | Rating ➦ ★★★★★★ |
| Episode 14 - [The Beta Test Initiation] |
| Details : Leonard and Penny deal with the idea of starting a relationship again and Raj finally finds a woman he can talk to without being drunk in the form of Siri on his new phone. Meanwhile Sheldon decides to start a YouTube series entitled Sheldon Cooper presents Fun with Flags with the help of Amy. |
| Guest Cast and Crew : Becky O'Donohue as Siri | John Ross Bowie as Barry Kripke | |
| Air Date : Jan. 26, 2012 | Rating ➦ ★★★★★★ |
| Episode 15 - [The Friendship Contraction] |
| Details : Sheldon's selfish demands force Leonard to reconsider their friendship. Meanwhile Wolowitz tries to pick his astronaut nickname. |
| Guest Cast and Crew : Carol Ann Susi as Debbie Wolowitz (voice) | Michael J. Massimino as Himself | Kevin Sussman as Stuart Bloom | |
| Air Date : Feb. 02, 2012 | Rating ➦ ★★★★★★ |
| Episode 16 - [The Vacation Solution] |
| Details : When Sheldon is forced to take his vacation he goes to work with Amy in her neurobiology lab. |
| Guest Cast and Crew : Nick Clifford as Phil | Joshua Malina as President Siebert | |
| Air Date : Feb. 09, 2012 | Rating ➦ ★★★★★★ |
| Episode 17 - [The Rothman Disintegration] |
| Details : Penny is horrified when Amy gives her a gift: a huge quite horrible painting of the two of them. With no good way to avoid displaying it she only hangs it up when Amy is over. When Amy catches her taking the painting down she's embarrassed and angry until Penny lies and says the gift made Bernadette jealous. When the deranged Professor Rothman is forced to retire both Sheldon and Kripke vie for his office. President Siebert refuses to resolve the dispute so Leonard arranges a one-on-one basketball game to decide (since they're both equally bad at sports). Neither one can even make a single basket so they end up deciding by seeing who can bounce the ball the highest. Sheldon wins; unfortunately the office is not what he'd hoped for: the thermostat is located in the office of a professor going through the hot flashes of menopause (thus Sheldon is too cold) the mockingbird outside his window is off-key with the annoying windchimes the perpetually naked Professor Rothman refuses to vacate and the Geology Department upstairs makes too much noise. Finally Sheldon gets his head stuck in the wall in an existing hole after which Leonard takes his picture before he goes for help. |
| Guest Cast and Crew : Lynn Philip Seibel as Professor Rothman | John Ross Bowie as Barry Kripke | Joshua Malina as President Siebert | |
| Air Date : Feb. 16, 2012 | Rating ➦ ★★★★★★★ |
| Episode 18 - [The Werewolf Transformation] |
| Details : Sheldon becomes agitated when his regular barber is out sick. Astronaut training causes Howard to reconsider wanting to go into space. Penny beats Leonard in chess the first time she plays. |
| Guest Cast and Crew : Peter Onorati as Angelo | Vernee Watson-Johnson as Althea | Carol Ann Susi as Debbie Wolowitz (voice) | |
| Air Date : Feb. 23, 2012 | Rating ➦ ★★★★★★★ |
| Episode 19 - [The Weekend Vortex] |
| Details : Sheldon must choose between joining Amy at her aunt's birthday party or playing videogames all weekend with the guys. |
| Guest Cast and Crew : Carol Ann Susi as Debbie Wolowitz (voice) | Kevin Sussman as Stuart Bloom | |
| Air Date : Mar. 08, 2012 | Rating ➦ ★★★★★★ |
| Episode 20 - [The Transporter Malfunction] |
| Details : Penny buys Leonard and Sheldon “Star Trek” collectibles as a thank-you leading Sheldon to be haunted by Mr. Spock. Meanwhile Raj decides he has met the “Future Mrs. Koothrappali” after his parents set him up on a date. |
| Guest Cast and Crew : Alice Amter as Mrs. Koothrappali | Chriselle Almeida as Lakshmi Choudry | Brian George as V.M. Koothrappali | Leonard Nimoy as Mr. Spock (voice) | |
| Air Date : Mar. 29, 2012 | Rating ➦ ★★★★★★★ |
| Episode 21 - [The Hawking Excitation] |
| Details : When Wolowitz gets to work with Stephen Hawking Sheldon is willing to do anything to meet his hero. |
| Guest Cast and Crew : Carol Ann Susi as Debbie Wolowitz (voice) | Stephen Hawking as Himself | |
| Air Date : Apr. 05, 2012 | Rating ➦ ★★★★★★★ |
| Episode 22 - [The Stag Convergence] |
| Details : After the guys throw Howard a bachelor party Bernadette reconsiders marrying him after learning about his sexual history. |
| Guest Cast and Crew : Wil Wheaton as Himself | John Ross Bowie as Barry Kripke | Kevin Sussman as Stuart Bloom | |
| Air Date : Apr. 26, 2012 | Rating ➦ ★★★★★★ |
| Episode 23 - [The Launch Acceleration] |
| Details : When NASA moves up Howard's mission he must face his fears and Bernadette's dad thus putting the wedding plans in jeopardy. Meanwhile Leonard says something surprising to Penny in the bedroom. |
| Guest Cast and Crew : Casey Sander as Mike Rostenkowski | Robert Clotworthy as Dave Roeger (voice) | Karl T. Wright as Jimmy | |
| Air Date : May. 03, 2012 | Rating ➦ ★★★★★★★ |
| Episode 24 - [The Countdown Reflection] |
| Details : The fifth season ends with Howard and Bernadette deciding to get married before his NASA mission causing the gang to scurry into overdrive in an effort to stage the wedding. NASA astronaut Mike Massimino has a cameo as himself. |
| Guest Cast and Crew : Carol Ann Susi as Debbie Wolowitz (voice) | Casey Sander as Mike Rostenkowski | Michael J. Massimino as Himself | Amy Tolsky as Joan | Endre Hules as Russian Mission Control (voice) | Pasha D. Lychnikoff as Dimitri | |
| Air Date : May. 10, 2012 | Rating ➦ ★★★★★★★ |