Highest Rated Episodes
When their apartment is robbed, Leonard and Sheldon turn to Howard and Raj to create a state-of-the-art security system.
Leonard has an idea for a new smartphone app and asks the guys for help, however Sheldon tries to take over the project, and ...read more Leonard has an idea for a new smartphone app and asks the guys for help, however Sheldon tries to take over the project, and Leonard fires him. show less
While Sheldon retires "Fun With Flags", Leonard, Howard and Raj look for something significant in a dead professor's ...read more While Sheldon retires "Fun With Flags", Leonard, Howard and Raj look for something significant in a dead professor's research, and Bernadette finds out what her colleagues really think of her. show less
Amy hosts a traditional Victorian Christmas Eve dinner as Raj's father comes to visit, while the guys try to shoo out a bird ...read more Amy hosts a traditional Victorian Christmas Eve dinner as Raj's father comes to visit, while the guys try to shoo out a bird they let into the university clean room. show less
Sheldon is annoyed when Leonard turns to Leslie for comfort after seeing Penny with another guy.
Bernadette makes Howard choose between herself and his mother, while Penny and Raj become upset when Priya returns to town and ...read more Bernadette makes Howard choose between herself and his mother, while Penny and Raj become upset when Priya returns to town and resumes her relationship with Leonard. show less
A trip to the pet store ends in a fight after Amy learns Sheldon has applied for a one-way mission to colonize Mars. Meanwhile, ...read more A trip to the pet store ends in a fight after Amy learns Sheldon has applied for a one-way mission to colonize Mars. Meanwhile, Leonard surprises Penny with a very "adult" purchase, and Raj gets into trouble when he snoops around Emily's apartment. show less
As Sheldon presses Leonard and Penny to set a wedding date, he encounters major changes in his relationship with Amy. Meanwhile, ...read more As Sheldon presses Leonard and Penny to set a wedding date, he encounters major changes in his relationship with Amy. Meanwhile, Raj wonders if he should break up with Emily, and Howard and Bernadette struggle to ask Stuart to move out. show less
When Raj is asked to create a message on the off chance a NASA mission discovers alien life, the guys fight over what he should ...read more When Raj is asked to create a message on the off chance a NASA mission discovers alien life, the guys fight over what he should do, while Penny contemplates returning to acting. show less
Leonard, Sheldon and Howard give lectures on science to junior high students. The girls ditch work to go to Disneyland. Raj ...read more Leonard, Sheldon and Howard give lectures on science to junior high students. The girls ditch work to go to Disneyland. Raj devises a date for Lucy that fixes their social anxiety problems. show less
While Sheldon is at home in Texas, the rest of the gang decorate for Christmas and think about how much he has affected their ...read more While Sheldon is at home in Texas, the rest of the gang decorate for Christmas and think about how much he has affected their lives. show less
Leonard and Sheldon's friendship is put to the test when Leonard wants to present a paper they co-authored at a physics ...read more Leonard and Sheldon's friendship is put to the test when Leonard wants to present a paper they co-authored at a physics convention, but Sheldon doesn't. show less
Sheldon is forced to work with Kripke on a project and must concoct an elaborate lie when he can't hold up his end of the ...read more Sheldon is forced to work with Kripke on a project and must concoct an elaborate lie when he can't hold up his end of the work. Howard and Raj get superhero figurines made of themselves. show less
Howard hooks up with Leslie, while Penny accidentally ruins Sheldon's spot on the couch.
Raj crashes Sheldon and Amy's second anniversary and interferes in Leonard and Penny's relationship. Howard gets caught ...read more Raj crashes Sheldon and Amy's second anniversary and interferes in Leonard and Penny's relationship. Howard gets caught in the middle of an argument between Bernadette and his mother. show less
Penny becomes jealous when a gorgeous new neighbor attracts the guys' attention.
Sheldon feels betrayed when Leonard returns from the North Sea and wants to spend his time with Penny instead of him. ...read more Sheldon feels betrayed when Leonard returns from the North Sea and wants to spend his time with Penny instead of him. Howard's latest foray into helping his mother has some disastrous side effects. show less
Penny continues to have doubts about her relationship with Leonard. Meanwhile, Howard becomes the target of practical jokes on ...read more Penny continues to have doubts about her relationship with Leonard. Meanwhile, Howard becomes the target of practical jokes on the space station. show less
Sheldon is scared that he is in a relationship when Amy asks him to meet her mother, and Leonard asks Howard and Bernadette to ...read more Sheldon is scared that he is in a relationship when Amy asks him to meet her mother, and Leonard asks Howard and Bernadette to set him up because he is the only person in the group without a girlfriend. show less
When Howard hooks up with Penny's old friend, his absence in the gang causes problems for the rest of the guys.
Sheldon has a revelation when he realizes why a song was stuck in his head. Meanwhile, Amy invites Dave over for dinner despite ...read more Sheldon has a revelation when he realizes why a song was stuck in his head. Meanwhile, Amy invites Dave over for dinner despite their previously awkward date, and Howard and Raj become obsessed with a fan of their band. show less
Sheldon wreaks havoc when he is stumped by a difficult physics question.
After being forced to deal with a sick Sheldon, the rest of the gang try to treat themselves to a Sheldon-free weekend.
Howard believes that his mom suffered a heart attack because he told her that he's marrying Bernadette, Sheldon freaks out ...read more Howard believes that his mom suffered a heart attack because he told her that he's marrying Bernadette, Sheldon freaks out over germs, and Penny and Priya bond. show less
Sheldon annoys the gang when Leonard can't drive him to and from work, so they try to teach him how to drive.
Penny enrolls in a college class and keeps it a secret from Leonard. Sheldon causes conflict with Dr. Stephen Hawking over an ...read more Penny enrolls in a college class and keeps it a secret from Leonard. Sheldon causes conflict with Dr. Stephen Hawking over an online game. show less
Sheldon and Bernadette spend the evening together while the rest of the gang go to a wine tasting party, but things get ...read more Sheldon and Bernadette spend the evening together while the rest of the gang go to a wine tasting party, but things get uncomfortable for Raj when Penny's ex-boyfriend Zack shows up and takes an interest in Claire. show less
Howard tries to bond with Bernadette's father during a fishing trip. When Sheldon is obligated to take care of a sick Amy, ...read more Howard tries to bond with Bernadette's father during a fishing trip. When Sheldon is obligated to take care of a sick Amy, she finds ways to take advantage of the situation. show less
The girls head to Las Vegas, while the guys try to invent something cool, but only come up with new ways to procrastinate.
Howard meets the half-brother he never knew he had. Penny is invited to appear on Wil Wheaton's podcast.
Sheldon triesto make friends with Kripke in the hope that it will get him access to a coveted computer at the university.
After arguing with Sheldon, Howard tries to make amends by taking him to NASA headquarters in Houston. Penny has second thoughts ...read more After arguing with Sheldon, Howard tries to make amends by taking him to NASA headquarters in Houston. Penny has second thoughts about quitting her waitressing job when her car dies. Amy gets involved in trying to find Raj a date. show less
Leonard gets upset when he discovers that Penny is seeing a new guy, so he tries to trick her into going on a date with him.
Howard questions his engineering abilities when he and Sheldon can't get a toy drone to fly. A cancelled flight nearly ...read more Howard questions his engineering abilities when he and Sheldon can't get a toy drone to fly. A cancelled flight nearly prevents Leonard from giving the commencement address at his former high school. Raj pits his parents against each other when his father cuts him off financially. show less
When Raj's parents set him up on a blind date, he finds he can talk to women with the aid of alcohol.
Sheldon is caught in the middle when Leonard and Penny argue about Penny's friend staying at her apartment.
Howard makes a decision whether or not to move out of his mother's house, while Sheldon is caught in the middle of an ...read more Howard makes a decision whether or not to move out of his mother's house, while Sheldon is caught in the middle of an argument between Amy and Wil Wheaton. show less
Sheldon and Penny bond over missing Leonard. Howard tries to help Raj get over his breakup with Lucy. Amy and Bernadette take a ...read more Sheldon and Penny bond over missing Leonard. Howard tries to help Raj get over his breakup with Lucy. Amy and Bernadette take a trip together to a biology convention. show less
Raj's honesty about his past comes back to haunt him after Emily takes a dislike to Penny. Meanwhile, the guys consider ...read more Raj's honesty about his past comes back to haunt him after Emily takes a dislike to Penny. Meanwhile, the guys consider investing in the comic book store. show less
Howard tries to get Penny's help in winning back Bernadette, but first has to confess the embarrassing reason why they broke ...read more Howard tries to get Penny's help in winning back Bernadette, but first has to confess the embarrassing reason why they broke up in the first place. Raj and Sheldon clash over a desk. show less
While Raj is wracked with guilt when he tries to date Lucy and Emily at the same time, Penny wrestles with whether to take a ...read more While Raj is wracked with guilt when he tries to date Lucy and Emily at the same time, Penny wrestles with whether to take a role in a cheesy movie and Sheldon is torn trying to choose between two gaming systems. show less
Sheldon and Penny agree to participate in an unusual experiment. Leonard, Amy, Raj and Emily spend the evening trying to escape ...read more Sheldon and Penny agree to participate in an unusual experiment. Leonard, Amy, Raj and Emily spend the evening trying to escape a room with a "zombie". Howard and Bernadette run into trouble at the airport after returning from Mrs. Wolowitz's funeral. show less
Leonard tries to keep everyone from finding out that he spent the night with Raj's sister, but Sheldon finds out and ...read more Leonard tries to keep everyone from finding out that he spent the night with Raj's sister, but Sheldon finds out and concocts an elaborate story to help him keep the secret from Raj. show less
Sheldon demands Leonard make up for a mistake from their past. Penny confronts Raj's ex-girlfriend, Lucy.
Sheldon decides to give up his work and focus on other tasks when a 15-year-old prodigy joins the university, so the other guys ...read more Sheldon decides to give up his work and focus on other tasks when a 15-year-old prodigy joins the university, so the other guys come up with a plan to get rid of him. show less
NASA cancel, and later reinstate Howard's mission into space, coinciding with his wedding. Leonard inadvertently jeopardizes ...read more NASA cancel, and later reinstate Howard's mission into space, coinciding with his wedding. Leonard inadvertently jeopardizes his relationship with Penny. show less
Leonard lies to Penny so that he and Sheldon can get out of watching her perform. However, Sheldon believes that the lie has too ...read more Leonard lies to Penny so that he and Sheldon can get out of watching her perform. However, Sheldon believes that the lie has too many loose ends, so he comes up with a new, unnecessarily complex one to replace it. show less
A date between Raj and Lucy takes both of them out of their comfort zones. After a trip to Las Vegas goes awry, the girls join ...read more A date between Raj and Lucy takes both of them out of their comfort zones. After a trip to Las Vegas goes awry, the girls join in on a Dungeons and Dragons game, which causes Amy and Sheldon to re-evaluate their relationship. show less
Leonard's mother makes a visit to his dismay and Sheldon's delight.
Penny struggles with Leonard's confession that he kissed another woman as they prepare to get married in Las Vegas. ...read more Penny struggles with Leonard's confession that he kissed another woman as they prepare to get married in Las Vegas. Meanwhile, Sheldon doesn't know what to do after Amy pushes pause on their relationship. show less