The Big Bang Theory

1The Robotic Manipulation

21 minSep 23, 2010★ 8.0

Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.

2The Cruciferous Vegetable Amplification

21 minSep 30, 2010★ 7.8

Realizing he will not live long enough to download his consciousness into a robot body, Sheldon tries to extend his life span.

3The Zazzy Substitution

21 minOct 7, 2010★ 7.5

The guys are concerned as Sheldon searches for an alternative to human companionship.

4The Hot Troll Deviation

20 minOct 14, 2010★ 7.7

An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.

5The Desperation Emanation

21 minOct 21, 2010★ 7.4

Leonard realizes he’s the only one without a girlfriend, while Sheldon wants to get rid of his.

6The Irish Pub Formulation

22 minOct 28, 2010★ 7.5

Leonard keeps an affair a secret from Sheldon, Howard and Raj.

7The Apology Insufficiency

21 minNov 4, 2010★ 7.5

Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.

8The 21-Second Excitation

19 minNov 11, 2010★ 7.8

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

9The Boyfriend Complexity

21 minNov 18, 2010★ 7.9

Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.

10The Alien Parasite Hypothesis

20 minDec 9, 2010★ 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.

11The Justice League Recombination

20 minDec 16, 2010★ 8.0

The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.

12The Bus Pants Utilization

21 minJan 6, 2011★ 7.4

Leonard's idea for a smartphone app derails his friendship with Sheldon.

13The Love Car Displacement

21 minJan 20, 2011★ 7.7

Bernadette runs into her ex-boyfriend while attending a science event with Wolowitz.

14The Thespian Catalyst

21 minFeb 3, 2011★ 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.

15The Benefactor Factor

20 minFeb 10, 2011★ 7.4

A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.

16The Cohabitation Formulation

20 minFeb 17, 2011★ 7.5

As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.

17The Toast Derivation

21 minFeb 24, 2011★ 7.6

Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.

18The Prestidigitation Approximation

21 minMar 10, 2011★ 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.

19The Zarnecki Incursion

21 minMar 31, 2011★ 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.

20The Herb Garden Germination

21 minApr 7, 2011★ 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.

21The Agreement Dissection

21 minApr 28, 2011★ 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.

22The Wildebeest Implementation

21 minMay 5, 2011★ 7.1

Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.

23The Engagement Reaction

20 minMay 12, 2011★ 7.6

When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.

24The Roommate Transmogrification

21 minMay 19, 2011★ 7.6

When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she's regrets.