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.
Streaming, rental and purchase options
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
With Leonard away, Sheldon and Penny spend quality time together sharing intimate secrets. Also, Wolowitz helps Raj get over his ex-girlfriend.
Directed by Mark CendrowskiWritten by Chuck Lorre, Steven Molaro, Tara Hernandez, Jim Reynolds, Steve Holland, Eric KaplanGuest stars Sophie Oda, Alex Ball, Aaron Takahashi, Regina King
Episode 2
Leonard and Sheldon's friendship is tested; Howard's latest foray into helping his mother has some disastrous side effects.
Directed by Mark CendrowskiWritten by Chuck Lorre, Steve Holland, Eric Kaplan, Jim Reynolds, Steven Molaro, Maria FerrariGuest stars Kevin Sussman, Barak Hardley
Episode 3
When the entire gang competes in a scavenger hunt designed by Raj, it brings out the best - and worst - in everyone.
Directed by Mark CendrowskiWritten by Jim Reynolds, Eric Kaplan, Steve Holland, David Goetsch, Steven Molaro, Maria FerrariGuest stars Kevin Sussman
Episode 4
Sheldon gets mad at Amy for ruining one of his favorite movies, Raj and Stuart try to make their online dating profiles more appealing, and Leonard tries to play the sympathy card with Penny.
Directed by Mark CendrowskiWritten by Chuck Lorre, Tara Hernandez, Steve Holland, Jim Reynolds, Steven Molaro, Maria FerrariGuest stars Kevin Sussman, Christine Corpuz, Christine Baranski
Episode 5
Amy starts working at Caltech which causes friction with Sheldon. Howard agrees with Sheldon who mentions this to Bernadette causing a big fight for the Wolowitzes.
Directed by Mark CendrowskiWritten by Steven Molaro, Jim Reynolds, Maria Ferrari, Steve Holland, Chuck Lorre, Eric KaplanGuest stars Todd Eric Andrews, Ayumi Iizuka
Episode 6
Sheldon's latest scientific breakthrough leaves him feeling like a fraud; a romantic gesture between Howard and Bernadette causes Penny to up her game with Leonard.
Directed by Mark CendrowskiWritten by Tara Hernandez, Steve Holland, Eric Kaplan, Jim Reynolds, Steven Molaro, Maria FerrariGuest stars Tom Fonss
Episode 7
Sheldon seeks payback when Arthur "Professor Proton" Jeffries asks Leonard for help on a project instead of him. Raj gets upset at Howard for crashing his night with the girls.
Directed by Mark CendrowskiWritten by Chuck Lorre, Jim Reynolds, Maria Ferrari, Anthony Del Broccolo, Eric Kaplan, Steven MolaroGuest stars Bill Nye, Bob Newhart
Episode 8
When a mistake comes to light, Sheldon makes Leonard walk a mile in his shoes; Penny decides to confront Raj's ex-girlfriend, Lucy.
Directed by Mark CendrowskiWritten by Steven Molaro, Steve Holland, Bill Prady, Eric Kaplan, Jim Reynolds, Maria FerrariGuest stars Kate Micucci, Morgan Hewitt, Meli Alexander
Episode 9
Sheldon protests when the gang drags him to Mrs. Wolowitz’s house for Thanksgiving. Meanwhile, Penny and Leonard must deal with a mistake from her past.
Directed by Mark CendrowskiWritten by Jim Reynolds, Maria Ferrari, Eric Kaplan, Steve Holland, Steven Molaro, Jeremy HoweGuest stars Carol Ann Susi, Casey Sander, Brian Thomas Smith
Episode 10
Leonard has to deal with the fallout of disproving Sheldon's new scientific discovery. Raj spends a week at Howard and Bernadette's apartment.
Directed by Mark CendrowskiWritten by Steve Holland, Maria Ferrari, Eric Kaplan, Jim Reynolds, Steven Molaro, Adam FabermanGuest stars John Ross Bowie, Ira Flatow, Wil Wheaton
Episode 11
While Sheldon is at home in Texas, the rest of the gang realizes how much he has changed their lives as they decorate the apartment Christmas tree.
Directed by Mark CendrowskiWritten by Steven Molaro, Jim Reynolds, Steve Holland, Tara Hernandez, Maria Ferrari, Eric KaplanGuest stars Kevin Sussman, Laurie Metcalf, Carol Ann Susi, Brian Thomas Smith
Episode 12
When Penny’s big acting break on NCIS is a bust, Leonard struggles to help her, which results in Penny asking Leonard a bold relationship question. Meanwhile, Raj and Stuart try to practice their social skills, and Sheldon navigates the intricacies of being funny.
Directed by Mark CendrowskiWritten by Tara Hernandez, Steve Holland, David Goetsch, Jim Reynolds, Steven Molaro, Maria FerrariGuest stars Kevin Sussman, Marcus Folmar
Episode 13
Sheldon tries to relax after he is forced to take a vacation. Meanwhile, Leonard struggles to be supportive of Penny after she quits her job, and Bernadette seeks Stuart’s help in replacing one of Howard’s comic books. Also, Amy receives an unwanted attention from a co-worker.
Directed by Mark CendrowskiWritten by Tara Hernandez, Jim Reynolds, Steve Holland, Maria Ferrari, Eric Kaplan, Steven MolaroGuest stars Kevin Sussman, Ed Lieberman, Ian Scott Rudolph, Josh Peck, Brian Posehn
Episode 14
After the guys can’t get Comic-Con tickets, Sheldon tries to hold his own convention and winds up spending a wild night with James Earl Jones. Meanwhile, the girls try to feel more mature by going to a fancy hotel for tea.
Directed by Mark CendrowskiWritten by Steve Holland, Eric Kaplan, Adam Faberman, David Goetsch, Jim Reynolds, Steven MolaroGuest stars James Earl Jones, Carrie Fisher
Episode 15
Sheldon and Amy take a train ride to Napa Valley with Howard and Bernadette on Valentine's Day. Leonard and Penny take Raj's dog to the vet when she accidentally eats some chocolate.
Directed by Mark CendrowskiWritten by Tara Hernandez, Steve Holland, Eric Kaplan, Jim Reynolds, Steven Molaro, Maria FerrariGuest stars Alex Ball, Eric Petersen, Tania Raymonde
Episode 16
Leonard buys a dining room table and it causes Sheldon to reevaluate the changes in his life. Meanwhile, Wolowitz is offered a chance to go back to space and Bernadette struggles with whether or not to encourage him.
Directed by Gay LinvillWritten by Steven Molaro, Tara Hernandez, Jim Reynolds, Steve Holland, Maria Ferrari, Chuck LorreGuest stars Carol Ann Susi, Christopher Neiman, Casey Sander, Michael J. Massimino
Episode 17
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.
Directed by Mark CendrowskiWritten by Steven Molaro, Tara Hernandez, Jim Reynolds, Steve Holland, Eric Kaplan, Maria FerrariGuest stars Laura Spencer, Gilda Stratton
Episode 18
When Sheldon visits his Mom in Houston, he is forced to confront a new reality. Meanwhile, Raj’s ‘Murder Mystery’ party starts some fights within the gang.
Directed by Mark CendrowskiWritten by Maria Ferrari, Steve Holland, Eric Kaplan, Jim Reynolds, Steven Molaro, Anthony Del BroccoloGuest stars Kevin Sussman, Laurie Metcalf
Episode 19
While Raj is wracked with guilt when he tries to date two women at once, Penny wrestles with whether to take a role in a cheesy movie and Sheldon is torn trying to choose between two gaming systems.
Directed by Anthony RichWritten by Steve Holland, Eric Kaplan, Bill Prady, David Goetsch, Jim Reynolds, Steven MolaroGuest stars Laura Spencer, Fernando Rivera, Rod Keller, Wil Wheaton
Episode 20
Sheldon faces a personal crisis after deciding he’s wasting his time with string theory. Meanwhile, a double date between Raj, Emily and the Wolowitzes ends in embarrassment for Howard.
Directed by Mark CendrowskiWritten by Steven Molaro, Steve Holland, Bill Prady, Chuck Lorre, Eric Kaplan, Jim ReynoldsGuest stars Laura Spencer, John Ross Bowie, Phyllis Timbes, Stephen Hawking
Episode 21
To prepare for a date with Emily, Howard acclimates Raj to horror movies. Penny and Sheldon are upset when they discover Amy and Bernadette lied to avoid hanging out with them.
Directed by Mark CendrowskiWritten by Steven Molaro, Jim Reynolds, Steve Holland, Tara Hernandez, Eric Kaplan, Adam FabermanGuest stars Laura Spencer, Carol Ann Susi, Kimberly Hébert Gregory
Episode 22
As the gang celebrates Star Wars Day, Sheldon has difficulty dealing with the recent death of Arthur "Professor Proton" Jeffries.
Directed by Mark CendrowskiWritten by Steve Holland, Maria Ferrari, Eric Kaplan, Jim Reynolds, Jeremy Howe, Steven MolaroGuest stars Bob Newhart
Episode 23
A bad day causes Penny to reevaluate her life choices – including Leonard. Meanwhile, Howard and Bernadette struggle to care for Mrs. Wolowitz, and Raj gets relationship advice from Sheldon.
Directed by Peter ChakosWritten by Chuck Lorre, Steve Holland, Eric Kaplan, Jim Reynolds, Jeremy Howe, Steven MolaroGuest stars Laura Spencer, Carol Ann Susi, Kaliko Kauahi, Casper Smart, Steve Valentine, Wil Wheaton
Episode 24
Sheldon get upset about his career, the destruction of the comic book store and Leonard and Penny's future living arrangements. Howard and Bernadette can't keep hold of a caretaker for his mother. With his entire world changing around him, Sheldon considers a major move.
Directed by Mark CendrowskiWritten by Steve Holland, Tara Hernandez, Eric Kaplan, Jim Reynolds, Jeremy Howe, Steven MolaroGuest stars Kevin Sussman, Carol Ann Susi, Monica Garcia Pérez, Christine Baranski
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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