The Big Bang Theory
About the Show
Arch-nerds Leonard and Sheldon may know more than their fair share about subatomic particles, but when it comes to people in general, and women in particular, they're absolutely clueless...
Series 8 Summary
As the eighth season of the US comedy about a group of clever but socially clueless scientists begins, Sheldon's great railway adventure comes to a halt and Penny grasps new opportunities.
Episode 1 - The Locomotion Interruption
Leonard and Amy take an unexpected road trip to Arizona to pick up Sheldon when his epic railway journey ends in chaos. Penny has an interview for a sales job at Bernadette's company.
Episode 2 - The Junior Professor Solution
When Sheldon is forced to teach a course at the university, Howard surprises everyone by enrolling on it
Episode 3 - The First Pitch Insufficiency
Howard is nervous when Nasa ask him to throw the first pitch at a baseball game for National Space Day. Sheldon claims that he and Amy have a superior relationship to the other couples in the group.
Episode 4 - The Hook-Up Reverberation
Raj's honesty about his past comes back to haunt him after his girlfriend Emily gives Penny the cold shoulder as a result. The guys consider becoming part-owners of Stuart's comic-book shop.
Episode 5 - The Focus Attenuation
Amy and Bernadette accuse Penny of spoiling their fun when she is forced to do some work during their weekend trip to Las Vegas. The guys get together to invent something of scientific importance.
Episode 6 - The Expedition Approximation
Sheldon and Raj set up a test to find out whether they could survive a dark-matter research expedition in a salt mine by simulating the conditions in a steam tunnel underneath the university
Episode 7 - The Misinterpretation Agitation
The guys help Penny out of an awkward professional situation when a smitten doctor turns up at her door after her flirtatious sales techniques on behalf of the pharmaceutical company work too well
Episode 8 - The Prom Equivalency
The girls decide to re-enact their high-school proms with their current partners, so the gang recreate the whole event on the roof of the apartment building, but Sheldon feels under too much pressure
Episode 9 - The Septum Deviation
When Leonard has minor surgery on his nose, Sheldon's the one who seems to be in need of sympathy. The impending divorce of Raj's parents motivates Howard and Bernadette to work on their own marriage.
Episode 10 - The Champagne Reflection
Sheldon says an emotional goodbye to Fun with Flags as he and Amy record the final episode of their internet show. Bernadette is shocked when Penny tells her how her colleagues really feel about her.
Episode 11 - The Clean Room Infiltration
Amy hosts a Victorian Christmas Eve dinner, complete with party games, and Raj, Leonard and Howard have pigeon problems
Episode 12 - The Space Probe Disintegration
Howard tries to calm a stressed-out Raj, who is anxiously awaiting the arrival of some data from a space probe that he helped to launch. Sheldon and Leonard go clothes shopping with Penny and Amy.
Episode 13 - The Anxiety Optimization
When Sheldon gets stuck in a rut with his research, he asks his friends to raise his stress levels and make him anxious, hoping the agitation will cure his mental block and lead to a breakthrough
Episode 14 - The Troll Manifestation
Leonard and Sheldon co-publish a physics paper but have to defend themselves against negative comments from an online critic. Penny, Amy and Bernadette confront embarrassing moments from the past.
Episode 15 - The Comic Book Store Regeneration
As the gang prepare for the reopening of Stuart's comic book shop, Howard gets some shocking news. Penny teaches Sheldon how to 'let it go' when he is irritated but struggles to follow her own advice.
Episode 16 - The Intimacy Acceleration
When the gang hear about an experiment that is designed to make participants fall in love, Sheldon and Penny put it to the test as a joke. Bernadette and Howard have big problems at the airport.
Episode 17 - The Colonization Application
Trouble arises when Amy learns that Sheldon has applied to take part in a one-way mission to colonise Mars. Raj snoops around Emily's apartment when she is called back to work during the evening.
Episode 18 - The Leftover Thermalization
Sheldon and Leonard fall out over a magazine article about their physics paper. A power cut at Mrs Wolowitz's house defrosts the meals she made before her death so the gang consume them in her honour.
Episode 19 - The Skywalker Incursion
When Leonard and Sheldon are invited to speak at Berkeley, they take a detour during the trip to try to meet one of their idols. Howard and Bernadette argue while clearing out Mrs Wolowitz's garage.
Episode 20 - The Fortification Implementation
When Sheldon and Amy build a blanket fort, they come to a major crossroads in their relationship. Howard meets Josh, the half-brother he never knew he had. Penny is invited to contribute to a podcast.
Episode 21 - The Communication Deterioration
When Raj is asked to create a message for Nasa to use if one of their missions discovers alien life, the boys argue over what he should do. Penny gets the opportunity to audition for a film role.
Episode 22 - The Graduation Transmission
Howard questions his engineering abilities when he and Sheldon can't get a toy drone to fly. A cancelled flight almost stops Leonard from giving the commencement address at his former high school.