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Season 8

160 :08x01 - The Locomotion Interruption

Sep/22/2014
Leonard and Amy end up taking an unexpected road trip to Arizona to go get Sheldon. Penny has an interview for a job at Bernadette's company. Stuart's relationship with Mrs. Wolowitz freaks out Howard.
Guest Stars: Carol Ann Susi as Mrs. Wolowitz | Kevin Sussman as Stuart | Stephen Root as Don | David Barrera as Officer Hernandez | Robert Noble as Older Gentleman | Tonja Kahlens as Woman | Anil Margsahayam as Man
Director: Mark Cendrowski

161 :08x02 - The Junior Professor Solution

Sep/22/2014
After Sheldon is forced to teach a class, Howard manages to surprise everybody by taking it. Amy plays both Penny and Bernadette as the tension between them increases in regards to Penny's training for her new job at Bernadette's company.
Guest Stars: Regina King as Mrs. Davis
Director: Mark Cendrowski

162 :08x03 - The First Pitch Insufficiency

Sep/29/2014
Wolowitz feels really nervous when NASA asks him to throw out the first pitch at a Los Angeles Angels game. Leonard and Penny attempt to show Sheldon he is wrong after he says that he and Amy are a "superior couple."
Guest Stars: Michael J. Massimino as Himself | Malcolm Foster Smith as Roy | Michael Araujo as Stadium Announcer
Director: Mark Cendrowski

163 :08x04 - The Hook-Up Reverberation

Oct/06/2014
Penny receives the cold shoulder from Raj's girlfriend after he tells her some information about their past history. The boys think about buying into Stuart's comic-book emporium.
Guest Stars: Kevin Sussman as Stuart | Laura Spencer as Emily Sweeney
Director: Mark Cendrowski

164 :08x05 - The Focus Attenuation

Oct/13/2014
After the guys decide to have a physicist's retreat, the girls head to Las Vegas for the weekend.
Director: Mark Cendrowski

165 :08x06 - The Expedition Approximation

Oct/20/2014
Penny receives a company car from the pharmaceutical company where she's now employed but has trouble coming up with the money to pay back Leonard for the one he bought for her. Meanwhile, Sheldon and Raj look at a potential research grant.
Director: Mark Cendrowski
Songs: Merle Travis -- Dark as a Dungeon

166 :08x07 - The Misinterpretation Agitation

Oct/30/2014
At her new job, Penny has a client who develops a crush on her. It turns out that he is a middle-aged version of Howard Wolowitz. Amy and Bernadette argue over a photo shoot of female scientists.
Special Guest Stars: Billy Bob Thornton as Dr. Oliver Lorvis |
Guest Stars: Annie O'Donnell as Mrs. Lorvis
Director: Mark Cendrowski

167 :08x08 - The Prom Equivalency

Nov/06/2014
Amy, Bernadette, and Penny decide to re-enact their high school proms with their respective fellows. Raj, Emily, and Stuart are included too.
Guest Stars: Laura Spencer as Emily Sweeney | Kevin Sussman as Stuart | Kara Luiz as Jeanie | Carol Ann Susi as Mrs. Wolowitz
Director: Mark Cendrowski

168 :08x09 - The Septum Deviation

Nov/13/2014
Sheldon panics when Leonard goes into the hospital for an operation. Meanwhile, Raj learns that his parents have gotten a divorce.
Director: Anthony Rich

169 :08x10 - The Champagne Reflection

Nov/20/2014
Sheldon retires his Fun With Flags You Tube series, while Leonard, Howard, and Raj look through the papers of a deceased colleague and Bernadette discovers what her boss really thinks of her.
Special Guest Stars: LeVar Burton as Himself |
Guest Stars: John Ross Bowie as Barry Kripke | Stephen Root as Don | Paul Wilson (1) as Professor Sharpe
Director: Mark Cendrowski

170 :08x11 - The Clean Room Infiltration

Dec/11/2014
Amy fixes a traditional Victorian Era Christmas Eve dinner whose guest list includes Raj's newly separated father, visiting from India.
Guest Stars: Brian George (1) as Dr. Koothrappali | Dakin Matthews as Santa Claus
Director: Mark Cendrowski
Songs: Covered by Bernadette -- Here Comes Santa Claus, Covered by Leonard, Howard, and Raj -- Jingle Bells

171 :08x12 - The Space Probe Disintegration

Jan/08/2015
Raj is concerned over whether a probe he designed will work in outer space. Penny and Amy coerce Leonard and Sheldon into taking them shopping.
Guest Stars: Noel de Souza as Old Man in Car
Director: Mark Cendrowski

172 :08x13 - The Anxiety Optimization

Jan/29/2015
The gang tries to help Sheldon when he becomes stuck in a rut at work by increasing his anxiety level. Howard teases Raj with a new game called "Cinnamon or Emily?"
Guest Stars: Laura Spencer as Emily Sweeney | Edward Lieberman as Man
Director: Mark Cendrowski
Songs: Johnny Galecki, Kaley Cuoco -- Soft Kitty

173 :08x14 - The Troll Manifestation

Feb/05/2015
Leonard and Sheldon publish a paper which is widely accepted except for comments from an internet troll. Meanwhile, the girls reminisce about embarassing incidents from their past which include internet videos featuring Penny and Bernadette.
Special Guest Stars: Stephen Hawking as Himself
Director: Mark Cendrowski

174 :08x15 - The Comic Book Store Regeneration

Feb/19/2015
Sheldon becomes annoyed after discovering that Amy has been helping Kripke with his research. Stuart finally reopens the comic book store. Howard gets a disturbing phone call regarding his mother.
Special Guest Stars: Nathan Fillion as Himself |
Guest Stars: Kevin Sussman as Stuart | John Ross Bowie as Barry Kripke | Angela Relucio as Hostess
Director: Mark Cendrowski

175 :08x16 - The Intimacy Acceleration

Feb/26/2015
Penny agrees to be part of Sheldon's intimacy experiment. Meanwhile, the airline loses the ashes of Mrs. Wolowitz that Howard was bringing home from Florida.
Guest Stars: Laura Spencer as Emily Sweeney | Max Adler as Zombie
Director: Mark Cendrowski

176 :08x17 - The Colonization Application

Mar/05/2015
Amy and Sheldon buy a pet turtle together. Sheldon plans on becoming a colonist on Mars someday. Penny and Leonard worry that they are becoming boring. Raj snoops around Emily's apartment while she's away for the evening.
Guest Stars: Laura Spencer as Emily Sweeney
Director: Mark Cendrowski

177 :08x18 - The Leftover Thermalization

Mar/12/2015
When the loss of electricity in the Wolowitz house leads to the defrosting of the final meal cooked by Mrs. Wolowitz, the gang decides to consume it. Meanwhile a magazine publishes an article about Sheldon and Leonard's work but only Sheldon's name is mentioned in the article.
Guest Stars: Kevin Sussman as Stuart
Director: Mark Cendrowski

178 :08x19 - The Skywalker Incursion

Apr/02/2015
When Leonard and Sheldon are invited to speak at UC Berkeley, they take a detour to try to meet an idol. Also, when Bernadette and Howard battle over the fate of his Dr. Who TARDIS, Raj and Amy offer to settle the dispute with a game of ping pong.

Source: CBS

179 :08x20 - The Fortification Implementation

Apr/09/2015
Howard discovers a family secret. Sheldon and Amy build a fort. Penny receives an audition for a Kevin Smith movie.

180 :08x21 - The Communication Deterioration

Apr/16/2015
The guys clash about a message that could be used for contacting aliens.

181 :08x22 - The Graduation Transmission

Apr/23/2015
Leonard and Penny are headed to New Jersey, where Leonard is scheduled to give a high school commencement speech. Raj's father is tired of his reckless spending habits.
Guest Stars: Brian George (1) as Dr. Koothrappali | Alice Amter as Mrs. Koothrappali

182 :08x23 - The Maternal Combustion

Apr/30/2015
Sheldon's and Leonard's mothers finally come face to face and their personalities collide.

183 :08x24 - The Commitment Determination

May/07/2015
Sheldon wants Penny and Leonard to decide on a wedding date.
Classification: Scripted
Genre: Comedy
Status: On Hiatus
Network: CBS ( USA)
Airs: Thursdays at 08:00 pm
Runtime: 30 Minutes
Premiere: September 24, 2007
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