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Season 8

160 :08x01 - The Locomotion Interruption

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

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

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

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

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

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

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

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

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

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

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

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.
Director: Mark Cendrowski

172 :08x13 - The Anxiety Optimization

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
Director: Mark Cendrowski
Songs: Johnny Galecki, Kaley Cuoco -- Soft Kitty
Warning: The Big Bang Theory guide may contain spoilers
Classification: Scripted
Genre: Comedy
Status: Returning Series
Network: CBS ( USA)
Airs: Thursdays at 08:00 pm
Runtime: 30 Minutes
Premiere: September 24, 2007
Episode Order: 24
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