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
The Big Bang Theory is available to stream on DirecTV On Demand, HBO (Via Hulu), HBO Max, Max (Via Amazon Prime), and YouTube TV in United States. You can also rent or buy it from Google Play, Amazon, Apple TV, and Fandango at Home. Use the direct links below to open the provider.
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
Penny's first date with Leonard goes awry; Penny finds Sheldon to be an unwilling confidant.
Directed by Mark CendrowskiWritten by Bill Prady, David Goetsch, Steven MolaroGuest stars Carol Ann Susi
Episode 2
A jealous Leonard reacts to Penny's new guy by rebounding with Leslie.
Directed by Mark CendrowskiWritten by Chuck Lorre, Bill Prady, Lee AronsohnGuest stars Sara Gilbert, Travis Schuldt
Episode 3
Sheldon creates a monster when he introduces Penny to online gaming.
Directed by Mark CendrowskiWritten by Eric Kaplan, Steven Molaro, Nikki LorreGuest stars Sara Gilbert, Mark Harelik, Tyler Jon Olson, Mark Hames
Episode 4
Raj gets an inflated ego and makes a play for Penny after being referenced in a magazine article.
Directed by Mark CendrowskiWritten by Chuck Lorre, Bill Prady, Tim Doyle, Stephen EngelGuest stars Alice Amter, Brian George, Mark Harelik, Charlie Sheen
Episode 5
Leonard and his friends stage an intervention to force Sheldon to face his fear of driving.
Directed by Mark CendrowskiWritten by Steven Molaro, Bill Prady, David Goetsch, Lee AronsohnGuest stars Octavia Spencer, Elena Campbell-Martinez, Livia Treviño
Episode 6
Sheldon and the gang are confused when a young grad student is attracted to him.
Directed by Mark CendrowskiWritten by Tim Doyle, Richard A. Rosenstock, Stephen Engel, Daley HaggarGuest stars Sara Gilbert, Riki Lindhome, Emily Happe
Episode 7
When Sheldon bans Penny from the apartment for numerous minor infractions, she decides to retaliate.
Directed by Mark CendrowskiWritten by Bill Prady, Steven Molaro, Tim Doyle, Jennifer GlickmanGuest stars Lio Tipton, Samantha Potter
Episode 8
Leonard inadvertently steals away the new woman Wolowitz thinks is the love of his life.
Directed by Mark CendrowskiWritten by Bill Prady, David Goetsch, Jennifer GlickmanGuest stars Carol Ann Susi, Robert Clotworthy, Sara Rue, Jennifer Hale
Episode 9
Sheldon is thrilled when Leonard starts dating a woman who meets Sheldon's stringent standards.
Directed by Mark CendrowskiWritten by Steven Molaro, David Goetsch, Richard A. Rosenstock, Stephen EngelGuest stars Sara Rue
Episode 10
Leonard asks Penny for advice when his new relationship starts moving too fast.
Directed by Mark CendrowskiWritten by Chuck Lorre, Steven Molaro, Bill Prady, Richard A. RosenstockGuest stars Sara Rue
Episode 11
Penny starts dating Leonard's handsome colleague; Leonard and his friends are tortured by Sheldon's obsession with gift-giving etiquette.
Directed by Mark CendrowskiWritten by Bill Prady, Eric Kaplan, Richard A. Rosenstock, Stephen EngelGuest stars Michael Trucco, Michael Hyatt
Episode 12
Penny's criticism of Wolowitz's romantic life pushes him into depression and AWOL for a fighting robot battle the rest of guys are depending on him for.
Directed by Mark CendrowskiWritten by Bill Prady, Steven Molaro, Richard A. Rosenstock, Daley HaggarGuest stars John Ross Bowie, Carol Ann Susi
Episode 13
Sheldon creates a scientific procedure for making friends.
Directed by Mark CendrowskiWritten by Bill Prady, Chuck Lorre, Steven Molaro, Richard A. RosenstockGuest stars John Ross Bowie, Will Deutsch, Jane Galloway Heitz, Jade Zdanow
Episode 14
Sheldon's solution to Penny's financial difficulty leads to a confrontation between Leonard and Penny's ex-boyfriend.
Directed by Mark CendrowskiWritten by Chuck Lorre, Steven Molaro, Eric Kaplan, Richard A. RosenstockGuest stars Brian Patrick Wade
Episode 15
Leonard and Penny are drawn together after a disastrous visit from Leonard's mother.
Directed by Mark CendrowskiWritten by Chuck Lorre, Bill Prady, Steven Molaro, Richard A. RosenstockGuest stars Christine Baranski
Episode 16
A paintball game leads to a fight between Sheldon and Penny, and romance for Leslie and Wolowitz.
Directed by Mark CendrowskiWritten by Chuck Lorre, Bill Prady, Lee AronsohnGuest stars Sara Gilbert, Carol Ann Susi
Episode 17
Leonard, Sheldon and Wolowitz are ecstatic to learn that a famous science-fiction actress (Summer Glau) is on board the train they are taking to San Francisco.
Directed by Mark CendrowskiWritten by Bill Prady, David Goetsch, Tim Doyle, Stephen EngelGuest stars Summer Glau, Robert Clotworthy, George F. Smoot
Episode 18
Penny's home business turns into a complete nightmare when Sheldon takes over.
Directed by Peter ChakosWritten by Bill Prady, David Goetsch, Richard A. Rosenstock, Lee Aronsohn
Episode 19
Penny squares off with a new beautiful female neighbor who may become the building's "new Penny."
Directed by Mark CendrowskiWritten by Steven MolaroGuest stars Valerie Azlynn, Carol Ann Susi
Episode 20
A fellow comic book enthusiast's hitting on Penny leads to Leonard and Howard going to a bar's Ladies' Night.
Directed by Mark CendrowskiWritten by David GoetschGuest stars Kevin Sussman
Episode 21
Leonard and Koothrappali escort a heartbroken Wolowitz to Las Vegas, and Sheldon becomes locked out of his apartment and must stay with Penny.
Directed by Mark CendrowskiWritten by Steven Molaro, Jessica Ambrosetti, Nikki Lorre, Andy RothGuest stars Jodi Lyn O'Keefe
Episode 22
Penny's second date with Stuart sees her making a comment that gives Leonard new hope for a relationship with her. Wolowitz realizes there's a crucial error in a NASA project he's working on.
Directed by Mark CendrowskiWritten by Chuck Lorre, Steven Molaro, Bill Prady, Lee AronsohnGuest stars Kevin Sussman, Travis Davis, Robert Clotworthy
Episode 23
The guys' plan to work over the summer at the North Pole makes Penny revaluate her feelings for Leonard.
Directed by Mark CendrowskiWritten by Eric Kaplan, Richard A. RosenstockGuest stars Alice Amter, Brian George, Carol Ann Susi
Episode information updated Jul 23, 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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