E15 • The Benefactor Factor

E1 • The Robotic Manipulation

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

21m • 2010

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

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.

20m • 2010

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

E3 • The Zazzy Substitution

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

21m • 2010

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

E4 • The Hot Troll Deviation

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

19m • 2010

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

E5 • The Desperation Emanation

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

20m • 2010

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

E6 • The Irish Pub Formulation

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

21m • 2010

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

E7 • The Apology Insufficiency

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

21m • 2010

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

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.

18m • 2010

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

E9 • The Boyfriend Complexity

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

20m • 2010

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

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.

19m • 2010

Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.

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.

19m • 2010

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

E12 • The Bus Pants Utilization

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

21m • 2010

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

E13 • The Love Car Displacement

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

20m • 2010

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

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.

21m • 2010

Hoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about a friend's girlfriend.

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.

19m • 2010

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

E16 • The Cohabitation Formulation

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

20m • 2010

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

E17 • The Toast Derivation

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

20m • 2010

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

E18 • The Prestidigitation Approximation

Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to continue being friends with Penny.

20m • 2010

Sheldon is baffled by Wolowitz's magic trick. Meanwhile, Leonard realizes dating Priya may make it impossible to continue being friends with Penny.

E19 • The Zarnecki Incursion

Sheldon's World of Warcraft online game account is hacked and he is determined to find out who did it. Also Penny shares some girl talk with her friends about Leonard and his new girlfriend.

21m • 2010

Sheldon's World of Warcraft online game account is hacked and he is determined to find out who did it. Also Penny shares some girl talk with her friends about Leonard and his new girlfriend.

E20 • The Herb Garden Germination

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.

20m • 2010

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.

E21 • The Agreement Dissection

When Leonard spends too much time in the shower with Priya, Sheldon charges Leonard with two violations of the roommate agreement.

20m • 2010

When Leonard spends too much time in the shower with Priya, Sheldon charges Leonard with two violations of the roommate agreement.

E22 • The Wildebeest Implementation

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

20m • 2010

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

E23 • The Engagement Reaction

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

19m • 2010

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

E24 • The Roommate Transmogrification

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

21m • 2010

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