The Big Bang Theory episodes
The Big Bang Theory
(2007 - Present) on CBSSeason 4 Episode Guide
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Season 4, Episode 1 | September 23rd, 2010 The Robotic Manipulation
Sheldon has been communicating with Amy Farrah Fowler for the past few months via text messages. Penny convinces Sheldon he should go on a date with her after he informs the group that he and Amy are going... more
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Season 4, Episode 2 | September 30th, 2010 The Cruciferous Vegetable Amplification
Determined to live long enough for the moment when man and machine become one, Sheldon decides he must cease all physical contact with the outside world. Using a computer screen and basic robot technology,... more
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Season 4, Episode 3 | October 7th, 2010 The Zazzy Substitution
After having a major disagreement about whose work is more important, Sheldon and Amy Farrah Fowler decide to end their relationship. As a means of coping, Sheldon begins to acquire cats for companionship.... more
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Season 4, Episode 4 | October 14th, 2010 The Hot Troll Deviation
While the gang has dinner at the Cheesecake Factory one evening, Wolowitz sees Bernadette, who he hasn't spoken to since they broke up. He realizes how much he misses her and wants to get back together... more
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Season 4, Episode 5 | October 21st, 2010 The Desperation Emanation
Amy Farrah Fowler tells Sheldon that she wants to introduce him to her mother. Sheldon freaks out, thinking that Amy wants to take their relationship to the next level while he is completely fine with... more
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Season 4, Episode 6 | October 28th, 2010 The Irish Pub Formulation
Koothrappali’s sister, Priya, comes for a visit and we find out she and Leonard have a romantic past unbeknownst to the rest of the guys because Leonard and Howard made a pact to never make a move on... more
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Season 4, Episode 7 | November 7th, 2010 The Apology Insufficiency
Leonard is still depressed about being alone but thinks his problem with women stems from the fact that he lacks confidence. He vows that the next time he meets a woman who he thinks is attractive, he... more
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Season 4, Episode 8 | November 11th, 2010 The 21-Second Excitation
The guys are very excited about going to a screening of Indiana Jones and Raiders of the Lost Ark because there are 21 seconds of additional footage being seen for the first time. When they arrive to wait... more
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Season 4, Episode 9 | November 18th, 2010 The Boyfriend Complexity
When Penny's dad comes to visit, Leonard discovers that she told her parents they were back together because Leonard was always their favorite boyfriend of hers. Leonard takes full advantage and plays... more
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Season 4, Episode 10 | December 9th, 2010 The Alien Parasite Hypothesis
While out at dinner with Penny and Bernadette, Amy Farrah Fowler meets Zack, Penny's ex-boyfriend. Much to her surprise, she finds herself flushed with an elevated heart rate and a tingling sensation.... more
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Season 4, Episode 11 | December 16th, 2010 The Justice League Recombination
Penny is dating Zack again and becomes upset when the guys make fun of him, making him feel stupid. When they go over to Penny's to apologize to him, they realize he can help them out with the New Year's... more
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Season 4, Episode 12 | January 6th, 2011 The Bus Pants Utilization
Leonard comes up with a great idea for an phone app and the guys all pitch in to help. When Sheldon becomes too controlling, Leonard fires him. Penny finds Sheldon by himself in the hall, she invites him... more
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Season 4, Episode 13 | January 20th, 2011 The Love Car Displacement
The gang goes on a road trip to Big Sur where the guys, Bernadette and Amy are speaking at a symposium. Penny tags along as Amy's plus one for the free spa weekend that's promised. When Wolowitz meets... more
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Season 4, Episode 14 | February 3rd, 2011 The Thespian Catalyst
Sheldon has agreed to take part in a short lecture series at the university. After completing his first lecture, he is shocked to find out just how much the students hate him as a teacher. Amy tells him... more
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Season 4, Episode 15 | February 10th, 2011 The Benefactor Factor
An incredibly wealthy older woman is considering making a huge donation to the school's science program. When she takes a liking to Leonard, Sheldon attempts to pimp Leonard out in the name of science.... more
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Season 4, Episode 16 | February 17th, 2011 The Cohabitation Formulation
Wolowitz and Bernadette are in a great spot in their relationship but he never stays over because he always has to run home to help his mom out in the morning. Bernadette wants them to move in together... more
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Season 4, Episode 17 | February 24th, 2011 The Toast Derivation
With Leonard dating Priya and Priya staying with her brother, Raj, the gang starts hanging out at Raj's place, much to Sheldon's disbelief. Amy Farrah Fowler helps with him the startling realization that... more
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Season 4, Episode 18 | March 10th, 2011 The Prestidigitation Approximation
Wolowitz drives Sheldon crazy as he tries to figure out Howard's magic trick. It seems to work as Howard does it for Raj and Penny and Sheldon spends the rest of the episode coming up with various ways... more
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Season 4, Episode 19 | March 31st, 2011 The Zarnecki Incursion
When someone hacks Sheldon's online gaming account, the guys go on a quest to find the culprit. more
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Season 4, Episode 20 | April 7th, 2011 The Herb Garden Germination
Sheldon and Amy experiment on their friends by spreading gossip, while Howard takes a big step in his relationship with Bernadette. more
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Season 4, Episode 21 | April 28th, 2011 The Agreement Dissection
Sheldon and Priya knock heads when she uses her lawyer skills to pick apart the roommate agreement. Frustrated, Sheldon goes out and ends up spending a girls' night with Penny, Bernadette and Amy. more
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Season 4, Episode 22 | May 5th, 2011 The Wildebeest Implementation
Raj attempts to cure his social anxiety disorder of talking to women, while Penny uses Bernadette to spy on Leonard and his girlfriend. more
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Season 4, Episode 23 | May 12th, 2011 The Engagement Reaction
When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital. more
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Season 4, Episode 24 | May 19th, 2011 The Roommate Transmogrification
After hearing Leonard and Priya indulge in a Star Trek bedroom fantasy, Raj moves in with Sheldon on the fourth season finale. more
