Episodes

17 February, 2011 The Big Bang Theory 720p

S4 E16 - The Cohabitation Formulation

As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.
10 February, 2011 The Big Bang Theory 720p

S4 E15 - The Benefactor Factor

A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.
03 February, 2011 The Big Bang Theory 720p

S4 E14 - The Thespian Catalyst

Hoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about a friend's girlfriend.
20 January, 2011 The Big Bang Theory 720p

S4 E13 - The Love Car Displacement

Bernadette runs into her ex-boyfriend while attending a science event with Wolowitz.
06 January, 2011 The Big Bang Theory 720p

S4 E12 - The Bus Pants Utilization

Leonard's idea for a smartphone app derails his friendship with Sheldon.
16 December, 2010 The Big Bang Theory 720p

S4 E11 - The Justice League Recombination

The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.
09 December, 2010 The Big Bang Theory 720p

S4 E10 - The Alien Parasite Hypothesis

Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.
18 November, 2010 The Big Bang Theory 720p

S4 E9 - The Boyfriend Complexity

Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
11 November, 2010 The Big Bang Theory 720p

S4 E8 - The 21-Second Excitation

While the guys camp in line for a long-awaited movie screening, Penny and Bernadette invite Amy to her first slumber party.
04 November, 2010 The Big Bang Theory 720p

S4 E7 - The Apology Insufficiency

Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
28 October, 2010 The Big Bang Theory 720p

S4 E6 - The Irish Pub Formulation

Leonard keeps an affair a secret from Sheldon, Howard and Raj.
21 October, 2010 The Big Bang Theory 720p

S4 E5 - The Desperation Emanation

Leonard realizes he’s the only one without a girlfriend, while Sheldon wants to get rid of his.
14 October, 2010 The Big Bang Theory 720p

S4 E4 - The Hot Troll Deviation

An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
07 October, 2010 The Big Bang Theory 720p

S4 E3 - The Zazzy Substitution

The guys are concerned as Sheldon searches for an alternative to human companionship.
30 September, 2010 The Big Bang Theory 720p

S4 E2 - 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.
23 September, 2010 The Big Bang Theory 720p

S4 E1 - The Robotic Manipulation

Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.
24 May, 2010 The Big Bang Theory 720p

S3 E23 - The Lunar Excitation

While Penny worries that dating Leonard has ruined her for normal guys, Wolowitz and Koothrappali search for Sheldon's perfect match online.
17 May, 2010 The Big Bang Theory 720p

S3 E22 - The Staircase Implementation

Leonard tells Penny about how he met Sheldon for the first time...and what happened to the elevator.
10 May, 2010 The Big Bang Theory 720p

S3 E21 - The Plimpton Stimulation

Leonard and Sheldon compete for the attention of a famous female physicist.
03 May, 2010 The Big Bang Theory 720p

S3 E20 - The Spaghetti Catalyst

When Leonard and Penny aren't speaking, Sheldon goes to extremes to keep them both happy.