The Big Bang Theory: Season 4

2010 · 24 episodes · ★ 7.6

What Season 4 of The Big Bang Theory

Season 4 returns to Leonard and Sheldon in their Pasadena apartment, with their genius and social awkwardness fully intact. Couples move to the forefront. Sheldon spends time with Amy Fowler, while Howard tries to win over Bernadette. Leonard and Penny try to normalize their situation. Raj and Howard keep struggling to connect with others, and that difficulty fuels much of the drama. The scientists thus face changes they don't know how to handle.

24episodes

Sep 23, 2010premiered

May 19, 2011latest episode

8.3 hrtotal runtime

Season 4 Episodes

4x01 The Robotic Manipulation
Sep 23, 2010 · 21 min · ★ 8.0
Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.
Directing: Mark Cendrowski · Writing: Steven Molaro, Steve Holland, Eric Kaplan · Starring: Vernee Watson, Carol Ann Susi
4x02 The Cruciferous Vegetable Amplification
Sep 30, 2010 · 21 min · ★ 7.7
Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.
Directing: Mark Cendrowski · Writing: Steven Molaro, Jim Reynolds, Chuck Lorre · Starring: Steve Wozniak
4x03 The Zazzy Substitution
Oct 7, 2010 · 21 min · ★ 7.5
The guys are concerned as Sheldon searches for an alternative to human companionship.
Directing: Mark Cendrowski · Writing: Steven Molaro, Maria Ferrari, Lee Aronsohn · Starring: Laurie Metcalf
4x04 The Hot Troll Deviation
Oct 14, 2010 · 20 min · ★ 7.6
An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
Directing: Mark Cendrowski · Writing: Bill Prady, Maria Ferrari, Lee Aronsohn · Starring: George Takei, Carol Ann Susi, Katee Sackhoff
4x05 The Desperation Emanation
Oct 21, 2010 · 21 min · ★ 7.3
Leonard realizes he’s the only one without a girlfriend, while Sheldon wants to get rid of his.
Directing: Mark Cendrowski · Writing: Steven Molaro, Steve Holland, Chuck Lorre · Starring: Kevin Sussman, Carol Ann Susi, Annie O'Donnell, Charlotte Newhouse
4x06 The Irish Pub Formulation
Oct 28, 2010 · 22 min · ★ 7.5
Leonard keeps an affair a secret from Sheldon, Howard and Raj.
Directing: Mark Cendrowski · Writing: Bill Prady, Maria Ferrari, Eric Kaplan · Starring: Aarti Mann
4x07 The Apology Insufficiency
Nov 4, 2010 · 21 min · ★ 7.5
Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
Directing: Mark Cendrowski · Writing: Steven Molaro, Bill Prady, Steve Holland · Starring: Eliza Dushku, Neil deGrasse Tyson
4x08 The 21-Second Excitation
Nov 11, 2010 · 19 min · ★ 7.7
While the guys camp in line for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.
Directing: Mark Cendrowski · Writing: Steven Molaro, Steve Holland, Lee Aronsohn · Starring: Eric André, Wil Wheaton
4x09 The Boyfriend Complexity
Nov 18, 2010 · 21 min · ★ 7.9
Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
Directing: Mark Cendrowski · Writing: Steven Molaro, Bill Prady, David Goetsch · Starring: Keith Carradine
4x10 The Alien Parasite Hypothesis
Dec 9, 2010 · 20 min · ★ 7.4
Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.
Directing: Mark Cendrowski · Writing: Jim Reynolds, Maria Ferrari, Lee Aronsohn · Starring: Brian Thomas Smith
4x11 The Justice League Recombination Mid-Season Finale
Dec 16, 2010 · 20 min · ★ 7.9
The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.
Directing: Mark Cendrowski · Writing: Steven Molaro, Bill Prady, Steve Holland · Starring: Kevin Sussman, Brian Thomas Smith
4x12 The Bus Pants Utilization
Jan 6, 2011 · 21 min · ★ 7.4
Leonard's idea for a smartphone app derails his friendship with Sheldon.
Directing: Mark Cendrowski · Writing: Steven Molaro, Bill Prady, Eric Kaplan
4x13 The Love Car Displacement
Jan 20, 2011 · 21 min · ★ 7.7
Bernadette runs into her ex-boyfriend while attending a science event with Wolowitz.
Directing: Anthony Rich · Writing: Steven Molaro, Steve Holland, Lee Aronsohn · Starring: Rick Fox, Ed Lieberman
4x14 The Thespian Catalyst
Feb 3, 2011 · 21 min · ★ 7.5
Hoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about a friend's girlfriend.
Directing: Mark Cendrowski · Writing: Steven Molaro, Bill Prady, Maria Ferrari
4x15 The Benefactor Factor
Feb 10, 2011 · 20 min · ★ 7.4
A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.
Directing: Mark Cendrowski · Writing: Steve Holland, Chuck Lorre, Eric Kaplan · Starring: Jessica Walter, Joshua Malina
4x16 The Cohabitation Formulation
Feb 17, 2011 · 20 min · ★ 7.4
As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.
Directing: Mark Cendrowski · Writing: Steven Molaro, Bill Prady, Jim Reynolds · Starring: Aarti Mann, Carol Ann Susi
4x17 The Toast Derivation
Feb 24, 2011 · 21 min · ★ 7.6
Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.
Directing: Mark Cendrowski · Writing: Steven Molaro, Jim Reynolds, Chuck Lorre · Starring: Kevin Sussman, Aarti Mann, John Ross Bowie, LeVar Burton
4x18 The Prestidigitation Approximation
Mar 10, 2011 · 21 min · ★ 7.6
Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to continue being friends with Penny.
Directing: Mark Cendrowski · Writing: Steven Molaro, Chuck Lorre, Eric Kaplan · Starring: Aarti Mann
4x19 The Zarnecki Incursion
Mar 31, 2011 · 21 min · ★ 7.6
Sheldon's online-game account is hacked by Todd Zarnecki, who then proceeds to steal all his items prompting the guys to go on a quest to retrieve them. Penny, Bernadette and Amy discuss how Penny groomed Leonard to be willing to try various things and more adventurous boyfriend... for some other woman — Priya.
Directing: Peter Chakos · Writing: Bill Prady, Jim Reynolds, David Goetsch · Starring: Aarti Mann, Carol Ann Susi, Lanny Joon, Chris Reed
4x20 The Herb Garden Germination
Apr 7, 2011 · 21 min · ★ 7.9
Sheldon and Amy decide to start several rumors about the others as a test. Meanwhile, Howard takes his relationship with Bernadette to even higher level.
Directing: Mark Cendrowski · Writing: Steven Molaro, Bill Prady, Steve Holland · Starring: Alice Amter, Aarti Mann, Brian George, Brian Greene
4x21 The Agreement Dissection
Apr 28, 2011 · 21 min · ★ 7.4
When Leonard spends too much time in the shower with Priya, Sheldon charges Leonard with two violations of the roommate agreement. However, before he can get too far, Priya uses her skills as a lawyer to nullify the charges due to the agreement's vague wording, much to Sheldon's dismay. When the guys take advantage of Priya's skills in order to eat Greek food on pizza night, Sheldon goes to Penny, who invites him to a girls' night out with Amy and Bernadette, which Sheldon agrees to after Penny mentions that they may be talking trash about Priya. After the girls drink some cocktails, they decide to take Sheldon dancing, which Sheldon reluctantly goes along with. After dancing, Sheldon takes an intoxicated Amy back to her apartment and as well as talking about Priya, meets a monkey who is addicted to smoking cigarettes. Amy tells Sheldon not to give in to Priya's law skills, before kissing him and going to her bathroom to vomit.
Directing: Mark Cendrowski · Writing: Steven Molaro, Chuck Lorre, Eric Kaplan · Starring: Aarti Mann, Arnold Chun, Tom Yi
4x22 The Wildebeest Implementation
May 5, 2011 · 21 min · ★ 7.1
Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.
Directing: Mark Cendrowski · Writing: Bill Prady, Maria Ferrari, Eddie Gorodetsky · Starring: Aarti Mann, Tiffany Dupont, Whitney Avalon
4x23 The Engagement Reaction
May 12, 2011 · 20 min · ★ 7.6
When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.
Directing: Howard Murray · Writing: Steven Molaro, Steve Holland, Chuck Lorre · Starring: Aarti Mann, Phil Abrams, Carol Ann Susi, Sharon Omi
4x24 The Roommate Transmogrification Season Finale
May 19, 2011 · 21 min · ★ 7.6
When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she's regrets.
Directing: Mark Cendrowski · Writing: Bill Prady, Jim Reynolds, Eric Kaplan · Starring: Alice Amter, Aarti Mann, Brian George, Carol Ann Susi