TV series
Smart is the new sexy.
Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
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Checked Jul 22, 2026
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Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
Choose an episode, then use the watch options above for the show.
Episode 1
Leonard and Amy make an unexpected trip to Arizona to fetch Sheldon; Penny interviews for a job at Bernadette's company; Stuart's relationship with Mrs. Wolowitz disturbs Howard.
Directed by Mark CendrowskiWritten by Tara Hernandez, Steve Holland, Maria Ferrari, Eric Kaplan, Jim Reynolds, Steven MolaroGuest stars Kevin Sussman, Stephen Root, Carol Ann Susi, David Barrera, Anil Margsahayam, Tonja Kahlens, Robert Noble
Episode 2
Sheldon is forced to teach a class as a Junior Professor and Howard decides to enroll in it. Meanwhile, Amy plays both sides when tension arises between Penny and Bernadette.
Directed by Mark CendrowskiWritten by Steven Molaro, Jim Reynolds, Tara Hernandez, Eric Kaplan, Steve Holland, Maria FerrariGuest stars Regina King
Episode 3
Wolowitz feels nervous when he is asked to throw the 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.
Directed by Mark CendrowskiWritten by Chuck Lorre, Steve Holland, Anthony Del Broccolo, Jim Reynolds, Steven Molaro, Maria FerrariGuest stars Michael J. Massimino, Malcolm Foster Smith, Michael Araujo
Episode 4
Raj's honesty comes back to haunt him when his new girlfriend is unfriendly to Penny. The guys think about becoming part owners in Stuart's store.
Directed by Mark CendrowskiWritten by Tara Hernandez, Jim Reynolds, Maria Ferrari, Steve Holland, Eric Kaplan, Steven MolaroGuest stars Kevin Sussman, Laura Spencer
Episode 5
The girls head to Las Vegas for some weekend fun, while the guys try to invent something cool, but only come up with new ways to procrastinate.
Directed by Mark CendrowskiWritten by Steve Holland, Maria Ferrari, Adam Faberman, Eric Kaplan, Jim Reynolds, Steven Molaro
Episode 6
Sheldon and Raj test whether they could survive a dark-matter research expedition in a salt mine by simulating the conditions in a steam tunnel deep underground. Meanwhile, Leonard and Penny seek advice from Howard and Bernadette after they fight about money.
Directed by Mark CendrowskiWritten by Steven Molaro, Tara Hernandez, Jim Reynolds, Steve Holland, David Goetsch, Maria Ferrari
Episode 7
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. Meanwhile, Amy and Bernadette argue over whether or not female scientists should play up their sexuality.
Directed by Mark CendrowskiWritten by Chuck Lorre, Steve Holland, Eric Kaplan, Jim Reynolds, Steven Molaro, Maria FerrariGuest stars Billy Bob Thornton, Annie O'Donnell
Episode 8
The girls decide to re-enact their high school proms with the guys. While Sheldon feels under pressure to commit to his relationship with Amy, Howard worries about who Stuart will bring as his date.
Directed by Mark CendrowskiWritten by Steve Holland, Eric Kaplan, Jim Reynolds, Jeremy Howe, Steven Molaro, Maria FerrariGuest stars Kevin Sussman, Laura Spencer, Kara Luiz, Carol Ann Susi
Episode 9
When Leonard gets minor surgery on his nose, Sheldon is the one in need of sympathy. Meanwhile, Raj's parents' impending divorce causes Howard and Bernadette to work on their own marriage.
Directed by Anthony RichWritten by Steven Molaro, Steve Holland, Tara Hernandez, Maria Ferrari, Bill Prady, Eric Kaplan
Episode 10
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. And Bernadette finds out what her colleagues really think of her.
Directed by Mark CendrowskiWritten by Steven Molaro, Tara Hernandez, Jim Reynolds, Steve Holland, David Saltzberg, David GoetschGuest stars John Ross Bowie, Stephen Root, LeVar Burton, Paul Willson
Episode 11
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. Amy throws an authentic Victorian Christmas party, while Sheldon seeks revenge on her for making him celebrate the holidays.
Directed by Mark CendrowskiWritten by Tara Hernandez, Jim Reynolds, Steve Holland, Maria Ferrari, Eric Kaplan, Jeremy HoweGuest stars Brian George, Dakin Matthews, Michael Reetz
Episode 12
Howard tries to distract Raj, who is anxiously awaiting data from a space probe he helped launch. Meanwhile, Sheldon and Leonard go dress shopping with Penny and Amy.
Directed by Mark CendrowskiWritten by Steve Holland, Eric Kaplan, Bill Prady, Jim Reynolds, Steven Molaro, Maria FerrariGuest stars Noel De Souza
Episode 13
When Sheldon becomes stuck in a rut with his work, the gang tries to help him by raising his stress levels. Howard teases Raj with a game called "Emily or Cinnamon?"
Directed by Mark CendrowskiWritten by Jim Reynolds, Steve Holland, Tara Hernandez, Maria Ferrari, Eric Kaplan, Adam FabermanGuest stars Laura Spencer, Ed Lieberman
Episode 14
Leonard and Sheldon publish a paper which is widely accepted except for comments from an internet troll. Meanwhile, the girls reminisce about embarrassing incidents from their past.
Directed by Mark CendrowskiWritten by Steven Molaro, Tara Hernandez, Jim Reynolds, Steve Holland, Eric Kaplan, Maria FerrariGuest stars Jim Meskimen, Stephen Hawking
Episode 15
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. Also, Leonard and Raj think they spot Nathan Fillion at a restaurant.
Directed by Mark CendrowskiWritten by Steve Holland, Maria Ferrari, Eric Kaplan, Jim Reynolds, Jeremy Howe, Steven MolaroGuest stars Kevin Sussman, John Ross Bowie, Nathan Fillion, Angela Relucio
Episode 16
As a joke, Sheldon and Penny try an experiment designed to make participants fall in love. Meanwhile, 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.
Directed by Mark CendrowskiWritten by Tara Hernandez, Jim Reynolds, Steve Holland, Eric Kaplan, David Goetsch, Steven MolaroGuest stars Laura Spencer, Stephanie Escajeda, Molly Morgan, Max Adler, Bruce Holman
Episode 17
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.
Directed by Mark CendrowskiWritten by Tara Hernandez, David Goetsch, Eric Kaplan, Jim Reynolds, Steven Molaro, Maria FerrariGuest stars Laura Spencer
Episode 18
Friction ensues when a magazine fails to mention Leonard in 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.
Directed by Mark CendrowskiWritten by Steven Molaro, Jim Reynolds, Steve Holland, Maria Ferrari, Eric Kaplan, Jeremy HoweGuest stars Kevin Sussman
Episode 19
When Leonard and Sheldon are invited to speak at UC 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.
Directed by Mark CendrowskiWritten by Tara Hernandez, Steve Holland, Jim Reynolds, Jeremy Howe, Steven Molaro, Maria FerrariGuest stars Tate Ellington, Michael Dempsey, Mark Barrett
Episode 20
When Sheldon and Amy build a blanket fort, they come to major crossroads in their relationship. Also, Howard meets the half-brother he never knew he had. Meanwhile, Penny is invited to appear on Wil Wheaton’s podcast, but things turn awkward when Leonard joins them.
Directed by Mark CendrowskiWritten by Tara Hernandez, Steve Holland, Saladin K. Patterson, Jim Reynolds, Steven Molaro, Maria FerrariGuest stars Matt Bennett, Rena Strober, Wil Wheaton, Kevin Smith
Episode 21
When Raj is asked to create a message in case 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.
Directed by Mark CendrowskiWritten by Jim Reynolds, Steve Holland, David Goetsch, Eric Kaplan, Jeremy Howe, Steven MolaroGuest stars Sara Erikson, Kelli Goss, Phoebe Neidhardt, Jeff Jingle, Mark Maitre
Episode 22
Howard questions his engineering abilities when he and Sheldon can’t 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.
Directed by Anthony RichWritten by Chuck Lorre, Steve Holland, Anthony Del Broccolo, David Goetsch, Eric Kaplan, Steven MolaroGuest stars Alice Amter, Brian George, Max Mittelman, Katherine Von Till
Episode 23
Personalities collide when Sheldon and Leonard’s mothers finally meet. Meanwhile, Howard finally decides to “man up” and do his fair share of the housework – but not without a little help from his friends.
Directed by Anthony RichWritten by Steven Molaro, Tara Hernandez, Jim Reynolds, Chuck Lorre, Jeremy Howe, Maria FerrariGuest stars Kevin Sussman, Laurie Metcalf, Christine Baranski
Episode 24
As Sheldon presses Leonard and Penny to set a wedding date, he encounters major changes in his own relationship with Amy. Meanwhile, Raj contemplates breaking up with Emily, and Howard and Bernadette struggle with asking Stuart to move out of their house.
Directed by Mark CendrowskiWritten by Chuck Lorre, Steve Holland, Maria Ferrari, Eric Kaplan, Jim Reynolds, Steven MolaroGuest stars Kevin Sussman, Laura Spencer
Episode information updated Jul 24, 2026
Johnny GaleckiLeonard Hofstadter
Jim ParsonsSheldon Cooper
Kaley CuocoPenny
Simon HelbergHoward Wolowitz
Kunal NayyarRajesh Koothrappali
Melissa RauchBernadette Rostenkowski
Mayim BialikAmy Farrah Fowler
Kevin SussmanStuart Bloom
CBSUnited States
Chuck Lorre ProductionsUnited States
Warner Bros. TelevisionUnited StatesMore shows like The Big Bang Theory.
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