The Big Bang Theory

On the eighth season premiere, Leonard and Amy take an unexpected road trip to Arizona to pick up Sheldon. Meanwhile, Penny interviews for a job at Bernadette’s company.

When Sheldon is forced to teach a class, Howard surprises everyone by taking it. Meanwhile, the tension between Penny and Bernadette gives Amy a chance to play both sides.

Howard is nervous when NASA asks him to throw out the first pitch at a Los Angeles Angels game for National Space Day. Also, Leonard and Penny try to prove Sheldon wrong after he claims that he and Amy are a superior couple.

Raj's honesty about his past comes back to bite him after his girlfriend, Emily, gives Penny the cold shoulder. Meanwhile, the guys consider becoming part-owners in Stuart's comic-book store.

Amy and Bernadette accuse Penny of being a buzzkill after she gets an email from work during their Vegas weekend. Meanwhile, the guys try to invent something cool, but only come up with new ways to procrastinate.

Sheldon and Raj (series star KUNAL NAYYAR) see if they can survive intense heat – and each other – when they venture deep underground in the name of science.

The guys try to help Penny out of an awkward work dilemma, when a smitten doctor shows up at her door after her flirtatious sales techniques work a little too well.

When the gang recreates a high-school prom night on the roof of the guys’ apartment building, Sheldon feels pressure to participate in all the typical romantic traditions.

When Leonard gets minor surgery on his nose, Sheldon has a major overreaction. Meanwhile Howard and Bernadette work on their marriage in light of Raj’s parents’ impending divorce.

While Sheldon says a tearful goodbye to the final installment of Fun with Flags, Leonard, Howard and Raj search for something significant in a dead professor's research.

Leonard and Howard turn to Raj for help in dealing with a work emergency when they nearly come to blows after blaming each other for a potential disaster at the university.

When the guys finally agree to do something the girls like, it leads to a confrontation between Leonard and Sheldon.

Sheldon worries his comfortable lifestyle is preventing him from achieving scientific progress so he asks his friends to make him miserable.

When an online bully destroys Leonard and Sheldon’s physics paper, the guys band together to take him down.

Howard receives some shocking news as everyone prepares for the reopening of Stuart's comic book store. Penny teaches Sheldon how to let it go but can't follow her own advice after she learns something infuriating about Amy.

When the gang hears about an experiment designed to make participants fall in love, Sheldon and Penny put it to the test as a joke. Meanwhile, Leonard, Amy, Raj and Emily spend the evening trying to escape a room with a zombie.

A trip to the pet store ends in a fight when Amy learns that Sheldon has applied for a one-way mission to colonize Mars. Also, Leonard surprises Penny with a very adult purchase; and Raj is caught snooping in Emily's apartment.

When a magazine incorrectly credits Sheldon as the lead scientist of the paper he co-wrote with Sheldon, things get awkward.

When Leonard and Sheldon are invited to speak at UC Berkeley, they take a detour to try to sneak on to George Lucas’s Skywalker Ranch to meet their idol.

When Sheldon and Amy build a blanket fort, they come to a big crossroads in their relationship. And Wolowitz is shocked when a man claiming to be his half-brother he never knew he had shows up at his front door.

When Raj is asked to create a message in case a NASA mission discovers alien life, the guys fight over what he should do. Meanwhile, Penny is torn between auditioning for a movie or keeping her successful pharmaceutical sales job.

Raj faces a threat to his easy lifestyle when he is cut off from the family fortune, while a canceled flight nearly prevents Leonard from speaking at his former high school.

Personalities collide when Sheldon & Leonard’s mothers finally meet. Meanwhile, Howard decides to “man up” and do his fair share of the housework – with a little help from his friends.

In the eighth season finale, Sheldon presses Leonard and Penny to choose a date for their wedding, while dealing with dramatic changes in his own relationship with Amy.