The Big Bang Theory Season 4 Watch The Big Bang Theory Episodes online

Watch The Big Bang Theory Season 4 episodes online  

View episodes from : Season 1 (17)   |   Season 2 (23)   |   Season 3 (23)   |   Season 4 (24)   |   Season 5 (24)   |   Season 6 (24)   |   Season 7 (24)   |   Season 8 (24)   |   Season 9 (24)   |   Season 10 (24)   |   Season 11 (11)   |  

The Big Bang Theory season 4 episode 1Episode 1: The Robotic Manipulation

Howard borrows a robotic arm from work and finds himself in a bind, literally. Sheldon goes on a real date with his new friend Amy and Penny helps....

Air Date: Sep 23, 2010


The Big Bang Theory season 4 episode 2Episode 2: The Cruciferous Vegetable Amplification

Sheldon obsesses over his limited lifespan and takes steps to ensure he will stay alive until it is possible to have his consciousness downloaded into...

Air Date: Sep 30, 2010


The Big Bang Theory season 4 episode 3Episode 3: The Zazzy Substitution

Sheldon misses his friendship with Amy and turns to feline companionship, to the dismay of all....

Air Date: Oct 07, 2010


The Big Bang Theory season 4 episode 4Episode 4: The Hot Troll Deviation

Howard's secret fantasies are revealed while Sheldon and Raj battle at the office....

Air Date: Oct 14, 2010


The Big Bang Theory season 4 episode 5Episode 5: The Desperation Emanation

All of the guys have girlfriends except Leonard, even Sheldon, who is anxious to be rid of Amy....

Air Date: Oct 21, 2010


The Big Bang Theory season 4 episode 6Episode 6: The Irish Pub Formulation

When Raj's sister comes to town, Leonard rekindles a romance with her and seeks to keep that information secret from Raj with the voluntary help from ...

Air Date: Oct 28, 2010


The Big Bang Theory season 4 episode 7Episode 7: The Apology Insufficiency

Howard's new project requires he get a security clearance and Sheldon's interview during the background check causes trouble....

Air Date: Nov 04, 2010


The Big Bang Theory season 4 episode 8Episode 8: The 21-Second Excitation

While the guys camp in line for a screening, Penny and Bernadette invite Amy to her first slumber party.

...

Air Date: Nov 11, 2010


The Big Bang Theory season 4 episode 9Episode 9: The Boyfriend Complexity

Penny's father shows up and she asks Leonard for help by pretending to still be her boyfriend. Bernadette joins Howard and Raj spend the night using a...

Air Date: Nov 18, 2010


The Big Bang Theory season 4 episode 10Episode 10: The Alien Parasite Hypothesis

A chance encounter with Zack, one of Penny's ex-boyfriends triggers an emotional response in Amy. Howard and Raj compete to decide who is a better sup...

Air Date: Dec 09, 2010


The Big Bang Theory season 4 episode 11Episode 11: The Justice League Recombination

After insulting Zack, Penny's new/old boyfriend, the guys make friends and ask him to help with their entry into a costume contest....

Air Date: Dec 16, 2010


The Big Bang Theory season 4 episode 12Episode 12: The Bus Pants Utilization

Leonard has an idea for a smartphone app but as usual Sheldon wants to take over. After being kicked off the team, Penny tries to play peacemaker....

Air Date: Jan 06, 2011


The Big Bang Theory season 4 episode 13Episode 13: The Love Car Displacement

The group goes on a road trip to attend a science event and Howard is dismayed when Bernadette encounters an ex....

Air Date: Jan 20, 2011


The Big Bang Theory season 4 episode 14Episode 14: The Thespian Catalyst

Sheldon turns to Penny for acting lessons as a way to improve as a teacher. Raj has inappropriate fantasies about Bernadette....

Air Date: Feb 03, 2011


The Big Bang Theory season 4 episode 15Episode 15: The Benefactor Factor

The guys attend a formal dinner to try to persuade wealthy patrons to donate to the physics department. Leonard has to decide how far he will go when ...

Air Date: Feb 10, 2011


The Big Bang Theory season 4 episode 16Episode 16: The Cohabitation Formulation

Howard and Bernadette consider moving in together; Leonard resumes dating Raj's sister, over Raj's vehement objections....

Air Date: Feb 17, 2011


The Big Bang Theory season 4 episode 17Episode 17: The Toast Derivation

Sheldon decides to invite new friends over when Leonard and the rest of the gang move their gatherings to Raj's place....

Air Date: Feb 24, 2011


The Big Bang Theory season 4 episode 18Episode 18: The Prestidigitation Approximation

Priya asks Leonard to choose between her and his friendship with Penny. Howard shows Sheldon a magic trick that Sheldon is determined to figure out....

Air Date: Mar 10, 2011


The Big Bang Theory season 4 episode 19Episode 19: The Zarnecki Incursion

After Sheldon's World of Warcraft account is hacked, the guys take it upon themselves to confront the culprit....

Air Date: Mar 31, 2011


The Big Bang Theory season 4 episode 20Episode 20: The Herb Garden Germination

Sheldon and Amy spread gossip about various members of the group as a social experiment. Howard must decide whether to pop the question to Bernadette....

Air Date: Apr 07, 2011


The Big Bang Theory season 4 episode 21Episode 21: The Agreement Dissection

Priya's increased presence at Leonard and Sheldon's apartment causes changes that Sheldon struggles with. To relax, he accompanies Penny and the girls...

Air Date: Apr 28, 2011


The Big Bang Theory season 4 episode 22Episode 22: The Wildebeest Implementation

Amy convinces Penny and Bernadette to use Bernadette as an undercover informant on Leonard and Priya's relationship. Raj decides to try out a new drug...

Air Date: May 05, 2011


The Big Bang Theory season 4 episode 23Episode 23: The Engagement Reaction

Howard musters up the courage to tell his mother that he is going to marry Bernadette. The news doesn't sit well and she ends up in the hospital....

Air Date: May 12, 2011


The Big Bang Theory season 4 episode 24Episode 24: The Roommate Transmogrification

Bernadette becomes the latest person in the group to receive her Ph.D., which leads to Howard being teased about his lack of the same. When Leonard st...

Air Date: May 19, 2011