Season 4, Episodes
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The Big Bang Theory (s04e20). Season 4, Episode 20 - Air Date: 04/07/2011
Sheldon and Amy experiment on their friends by spreading gossip, while Howard takes a big step in his relationship with Bernadette.
Source: CBS
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The Big Bang Theory (s04e01). Season 4, Episode 1 - Air Date: 09/23/2010
Howard uses a robotic arm for his own pleasure. Penny assists Sheldon with his first date.
Source: CBS
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The Big Bang Theory (s04e02). Season 4, Episode 2 - Air Date: 09/30/2010
Sheldon realizes he won't live long enough to download his consciousness into a robot body, and attempts to extend his lifespan.
Source: CBS
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The Big Bang Theory (s04e03). Season 4, Episode 3 - Air Date: 10/07/2010
The guys are concerned as Sheldon searches for an alternative to human companionship.
Source: CBS
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The Big Bang Theory (s04e04). Season 4, Episode 4 - Air Date: 10/14/2010
An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
Source: CBS
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The Big Bang Theory (s04e05). Season 4, Episode 5 - Air Date: 10/21/2010
Leonard realizes he's the only one without a girlfriend, while Sheldon wants to get rid of his.
Source: CBS
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The Big Bang Theory (s04e06). Season 4, Episode 6 - Air Date: 10/28/2010
Leonard keeps an affair secret from Sheldon, Howard and Raj.
Source: CBS
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The Big Bang Theory (s04e07). Season 4, Episode 7 - Air Date: 11/04/2010
Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
Source: CBS
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The Big Bang Theory (s04e08). Season 4, Episode 8 - Air Date: 11/11/2010
While the guys camp in line for a screening, Penny and Bernadette invite Amy to her first slumber party.
Source: CBS
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The Big Bang Theory (s04e09). Season 4, Episode 9 - Air Date: 11/18/2010
Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
Source: CBS
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The Big Bang Theory (s04e10). Season 4, Episode 10 - Air Date: 12/09/2010
Amy finds she has sexual feelings for Penny's ex, while Koothrappali and Wolowitz try to prove who would be the better superhero.
Source: CBS
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The Big Bang Theory (s04e11). Season 4, Episode 11 - Air Date: 12/16/2010
The guys find a "super" use for Penny's new boyfriend, Zack, when they enter a costume contest as the Justice League.
Source: CBS
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The Big Bang Theory (s04e12). Season 4, Episode 12 - Air Date: 01/06/2011
Leonard's idea for a smartphone app derails his friendship with Sheldon.
Source: CBS
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The Big Bang Theory (s04e13). Season 4, Episode 13 - Air Date: 01/20/2011
Tension runs high when everyone is staying at the same hotel for a science event and Bernadette runs into her ex-boyfriend.
Source: CBS
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The Big Bang Theory (s04e14). Season 4, Episode 14 - Air Date: 02/03/2011
Sheldon hopes acting lessons from Penny will help him become a better teacher. Meanwhile, Koothrappali fantasizes about his best friend's girlfriend.
Source: CBS
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The Big Bang Theory (s04e15). Season 4, Episode 15 - Air Date: 02/10/2011
A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.
Source: CBS
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The Big Bang Theory (s04e16). Season 4, Episode 16 - Air Date: 02/17/2011
As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.
Source: CBS
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The Big Bang Theory (s04e17). Season 4, Episode 17 - Air Date: 02/24/2011
Sheldon struggles to cope when he realizes it's actually Leonard who is the center of their social group.
Source: CBS
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The Big Bang Theory (s04e18). Season 4, Episode 18 - Air Date: 03/10/2011
Leonard must choose between new girlfriend Priya and his friendship with Penny. Meanwhile, Howard drives Sheldon crazy with a magic trick.
Source: CBS
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The Big Bang Theory (s04e19). Season 4, Episode 19 - Air Date: 03/31/2011
When someone hacks Sheldon's online game account, the guys go on a quest to find the culprit.
Source: CBS
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The Big Bang Theory (s04e21). Season 4, Episode 21 - Air Date: 04/28/2011
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The Big Bang Theory (s04e22). Season 4, Episode 22 - Air Date: 05/05/2011
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