The Big Bang Theory: Season 8

Sheldon and Raj test whether they could survive a dark-matter... More research expedition in a salt mine by simulating the conditions in a steam tunnel deep underground. Leonard and Penny seek advice from Howard and Bernadette after they fight about money.

During their weekend in Las Vegas, Bernadette and Amy accuse... More Penny of being a buzz kill. The guys try to invent the next big thing.

Raj's honesty comes back to haunt him when his new... More girlfriend is unfriendly to Penny. The guys think about becoming part owners in Stuart's store.

Wolowitz feels nervous when he is asked to throw the... More first pitch at a Los Angeles Angels game. Penny and Leonard want to prove Sheldon wrong after he says he and Amy are the better couple.

Sheldon pushes Leonard and Penny to choose a date for... More their wedding and deals with dramatic changes in his own relationship with Amy.

Personalities collide when Sheldon and Leonard’s mothers finally meet. Meanwhile,... More Howard finally decides to “man up” and do his fair share of the housework – but not without a little help from his friends.

Wolowitz questions his engineering abilities when he and Sheldon can’t... More get a toy drone to fly. Meanwhile, a cancelled flight nearly prevents Leonard from giving the commencement address at his former high school, and Raj pits his parents against each other when his father cuts him off financially.

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

Leonard and Amy make an unexpected trip to Arizona to... More fetch Sheldon; Penny interviews for a job at Bernadette's company; Stuart's relationship with Mrs. Wolowitz disturbs Howard.

Sheldon is forced to teach a class as a Junior... More Professor and Howard decides to enroll in it. Meanwhile, Amy plays both sides when tension arises between Penny and Bernadette.

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

Friction ensues when a magazine fails to mention Leonard in... More an article about the paper he co-wrote with Sheldon. Also, a blackout at Mrs. Wolowitz’s home leads to a final family dinner in her honor.

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

As a joke, Sheldon and Penny try an experiment designed... More to make participants fall in love. Also, Leonard, Amy, Raj and Emily spend the evening trying to escape a room with a “zombie.” And, after returning from Mrs. Wolowitz’ funeral, Bernadette and Howard run into trouble at the airport.

Wolowitz receives some shocking news as everyone prepares for the... More 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. Also, Leonard and Raj think they spot Nathan Fillion at a restaurant.

Leonard and Sheldon publish a paper which is widely accepted... More except for comments from an internet troll. Meanwhile, the girls reminisce about embarrassing incidents from their past.

The gang tries to help Sheldon when he becomes stuck... More in a rut at work by increasing his anxiety level. Howard teases Raj with a new game called "Cinnamon or Emily?"

Wolowitz tries to distract Raj, who is anxiously awaiting data... More from a space probe he helped launch. Meanwhile, Sheldon and Leonard go dress shopping with Penny and Amy.

Leonard and Howard turn to Raj for help in dealing... More with a work emergency when they nearly come to blows after blaming each other for a potential disaster at the university. Amy throws an authentic Victorian Christmas party, while Sheldon seeks revenge on her for making him celebrate the holidays.

While Sheldon says a tearful goodbye to the final installment... More of "Fun with Flags", Leonard, Howard and Raj search for something significant in a dead professor's research. And Bernadette is shocked to learn of her co-workers’ true feelings from Penny.