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Season 4 – The Big Bang Theory

Play trailer Poster for Season 4 – The Big Bang Theory Sep 2010 Comedy Play Trailer Watchlist
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80% Tomatometer 10 Reviews 91% Popcornmeter 500+ Ratings
Mensa-fied best friends and roommates Leonard and Sheldon, physicists who work at the California Institute of Technology, may be able to tell everybody more than they want to know about quantum physics, but getting through most basic social situations, especially ones involving women, totally baffles them. How lucky, then, that babe-alicious waitress/aspiring actress Penny moves in next door. Frequently seen hanging out with Leonard and Sheldon are friends and fellow Caltech scientists Wolowitz and Koothrappali. Will worlds collide? Does Einstein theorize in the woods?
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The Big Bang Theory — Season 4

The Big Bang Theory — Season 4

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Critics Consensus

Mayim Bialik adds welcome balance and wit to the cast of Big Bang Theory, elevating an otherwise fairly familiar fourth season.

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Critics Reviews

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Jarrah E Hodge Bitch Media Jan 7, 2021
To be fair, the show has some really funny moments-Christine Baranski as Leonard's mother is priceless-but having watched four seasons, I think its representations of women and people of color leave something to be desired. Go to Full Review Noel Murray The Verge Sep 5, 2018
[The Big Bang Theory] became a great show - and, perhaps not coincidentally, jumped about 30 places in the Nielsen ratings, into the Top 10 - once Penny stopped being the only female lead. Go to Full Review William Thomas Empire Magazine Oct 31, 2017
4/5
The smartest sitcom on TV faced a choice going into its fourth season: evolve or stagnate. Surprisingly for such a huge sitcom, Big Bang Theory did the former. Go to Full Review Eric Hochberger TV Fanatic Sep 30, 2013
3.5/5
Mayim fits in perfectly in The Big Bang Theory cast and played off of Kaley Cuoco just as well as Emmy Award-winning Parsons. Go to Full Review Jenna Busch IGN Sep 27, 2013
9/10
The Big Bang Theory is absolutely back with a vengeance. Go to Full Review Read all reviews

Audience Reviews

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matthias S @Thescreenasvor Jul 25, 2026 Season 4 is the weakest one for me so far, earning a 73%. It's definitely not bad, but the show doesn't really bring anything new or fresh to the table anymore. By this point, it feels like it's settled into a familiar formula. That said, it's still an easy and comforting watch, with enough funny moments and the cast's chemistry keeping things enjoyable. Even if it isn't reaching the highs of the earlier seasons, it's the kind of sitcom that's perfect to throw on and relax with. I'm still having a good time and looking forward to continuing the series. See more Michael A @Tomato547 Dec 18, 2025 I thought season 4 was good but probably the worst season of 1-9 (I haven't watched 10-12) I thought some of the jokes were funny but not as good as the later seasons and earlier. And I found Priya a little annoying. But it's still good and if you get into the series it's worth watching. See more Alexander K @Movienerd67 Dec 12, 2025 I LOVE THIS SHOW!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 1000000000000000000000/10 See more BRENDEN J @Moviefan109 Apr 9, 2025 Season four of The Big Bang Theory was a good and funny season with scenes that you will not stop laughing at. See more DJ W @RT92543869 Aug 14, 2023 Almost as good as season 2. It's really funny. See more letaiser @RT88401244 Jun 22, 2023 well I think that this season was okay because we had Lennard and rajs sister in a relationship what was not that bad I think her name was priha or some like that then we have the whole girls hangout together with raj and they talk about his problem what is pretty ardorable See more Read all reviews
The Big Bang Theory — Season 4

My Rating

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Cast & Crew

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Johnny Galecki

Leonard Hofstadter

Jim Parsons

Sheldon Cooper

Kaley Cuoco

Penny

Simon Helberg

Howard Wolowitz

Kunal Nayyar

Raj Koothrappali

Melissa Rauch

Bernadette Rostenkowski

Episodes

Episode 1 Aired Sep 23, 2010 The Robotic Manipulation Penny tags along on Sheldon's first date; Wolowitz finds a new use for a robotic arm. Details Episode 2 Aired Sep 30, 2010 The Cruciferous Vegetable Amplification Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span. Details Episode 3 Aired Oct 7, 2010 The Zazzy Substitution When Sheldon searches for an alternative to human companionship, the guys become concerned. Details Episode 4 Aired Oct 14, 2010 The Hot Troll Deviation An embarrassing secret of Wolowitz's is revealed; Raj and Sheldon get into a war at work. Details Episode 5 Aired Oct 21, 2010 The Desperation Emanation Leonard realizes he is the only one in his group without a girlfriend; Sheldon wants to get rid of his girlfriend. Details Episode 6 Aired Oct 28, 2010 The Irish Pub Formulation Leonard keeps an affair a secret from Sheldon, Howard and Raj. Details Episode 7 Aired Nov 4, 2010 The Apology Insufficiency Sheldon's interview with the FBI jeopardizes Wolowitz's security clearance. Details Episode 8 Aired Nov 11, 2010 The 21-Second Excitation While the guys camp out for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party. Details Episode 9 Aired Nov 18, 2010 The Boyfriend Complexity Penny asks Leonard to lie to her father (Keith Carradine); Howard, Raj and Bernadette pull an all-nighter at a telescope. Details Episode 10 Aired Dec 9, 2010 The Alien Parasite Hypothesis Amy realizes she has feelings for Penny's ex; Koothrappali and Wolowitz try to prove who would be a better superhero. Details Episode 11 Aired Dec 16, 2010 The Justice League Recombination The guys try to bond with Penny's new boyfriend through a costume contest. Details Episode 12 Aired Jan 6, 2011 The Bus Pants Utilization Leonard's idea for a smartphone application causes friction in his friendship with Sheldon. Details Episode 13 Aired Jan 20, 2011 The Love Car Displacement Bernadette runs into her ex-boyfriend (Rick Fox) while attending a science event with Wolowitz. Details Episode 14 Aired Feb 3, 2011 The Thespian Catalyst Sheldon takes acting lessons from Penny in hope of becoming a better teacher; Koothrappali fantasizes about his friend's girlfriend. Details Episode 15 Aired Feb 10, 2011 The Benefactor Factor A wealthy donor makes Leonard question what he is willing to do for science. Details Episode 16 Aired Feb 17, 2011 The Cohabitation Formulation Wolowitz considers taking things with Bernadette to the next level; Leonard and Raj's sister rekindle their relationship. Details Episode 17 Aired Feb 24, 2011 The Toast Derivation Sheldon is upset when he realizes Leonard is the center of their group of friends. Details Episode 18 Aired Mar 10, 2011 The Prestidigitation Approximation Leonard has to choose between Penny and his new girlfriend, Priya; Howard's magic trick drives Sheldon crazy. Details Episode 19 Aired Mar 31, 2011 The Zarnecki Incursion The guys try to figure out who hacked Sheldon's online-game account. Details Episode 20 Aired Apr 7, 2011 The Herb Garden Germination Amy and Sheldon spread gossip as part of an experiment; Howard decides to take a big step in his relationship with Bernadette. Details Episode 21 Aired Apr 28, 2011 The Agreement Dissection Priya dissects the roommate agreement; the ladies take Sheldon dancing. Details Episode 22 Aired May 5, 2011 The Wildebeest Implementation Raj tries to cure his social anxiety; Penny spies on Leonard and his girlfriend through Bernadette. Details Episode 23 Aired May 12, 2011 The Engagement Reaction Howard's mom winds up in the hospital after hearing news of her son's engagement to Bernadette. Details Episode 24 Aired May 19, 2011 The Roommate Transmogrification Bernadette gets her Ph.D., inspiring the guys to tease Wolowitz about his lack of a doctorate; Raj becomes Sheldon's roommate. Details

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The Big Bang Theory — Season 4

The Big Bang Theory The Big Bang Theory The Big Bang Theory View more photos

Season Info

Director
Mark Cendrowski, Anthony Rich, Howard Murray, Peter Chakos
Executive Producer
Chuck Lorre, Bill Prady
Screenwriter
Chuck Lorre, Bill Prady, Lee Aronsohn, David Goetsch, Eddie Gorodetsky, Adam Faberman, Steven Molaro, Eric Kaplan, Steve Holland, Jim Reynolds, Maria Ferrari
Network
CBS
Rating
TV-14 (D|L)
Genre
Comedy
Original Language
English
Release Date
Sep 23, 2010
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