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The Big Bang Theory — Season 4 Episode 16

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S04E16

The Cohabitation Formulation

★ 7.5 17 Feb 11 20 menit

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

Comedy

Episode

S04E01 23 Sep 10 ★ 7.9 21m The Robotic Manipulation Penny tags along on Sheldon's first ever date; Wolowitz finds a new use for a robotic arm.
S04E02 30 Sep 10 ★ 7.7 21m 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.
S04E03 7 Okt 10 ★ 7.5 21m The Zazzy Substitution The guys are concerned as Sheldon searches for an alternative to human companionship.
S04E04 14 Okt 10 ★ 7.6 20m The Hot Troll Deviation An embarrassing secret of Wolowitz's comes to light, while Sheldon and Raj have a small war at work.
S04E05 21 Okt 10 ★ 7.4 21m The Desperation Emanation Leonard realizes he’s the only one without a girlfriend, while Sheldon wants to get rid of his.
S04E06 28 Okt 10 ★ 7.5 22m The Irish Pub Formulation Leonard keeps an affair a secret from Sheldon, Howard and Raj.
S04E07 4 Nov 10 ★ 7.6 21m The Apology Insufficiency Sheldon's answers during an FBI interview put Wolowitz's security clearance in jeopardy.
S04E08 11 Nov 10 ★ 7.8 19m 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.
S04E09 18 Nov 10 ★ 7.9 21m The Boyfriend Complexity Penny asks Leonard to lie to her father, while Howard, Raj and Bernadette pull an all-nighter at a telescope.
S04E10 9 Des 10 ★ 7.4 20m 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.
S04E11 16 Des 10 ★ 7.9 20m 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.
S04E12 6 Jan 11 ★ 7.4 21m The Bus Pants Utilization Leonard's idea for a smartphone app derails his friendship with Sheldon.
S04E13 20 Jan 11 ★ 7.8 21m The Love Car Displacement Bernadette runs into her ex-boyfriend while attending a science event with Wolowitz.
S04E14 3 Feb 11 ★ 7.5 21m 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.
S04E15 10 Feb 11 ★ 7.4 20m The Benefactor Factor A wealthy donor to the university makes Leonard consider how far he's willing to go for the sake of science.
S04E16 17 Feb 11 ★ 7.5 20m Sedang diputar The Cohabitation Formulation As Wolowitz contemplates taking things with Bernadette to the next level, Leonard rekindles his relationship with Raj's sister.
S04E17 24 Feb 11 ★ 7.6 21m 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.
S04E18 10 Mar 11 ★ 7.5 21m 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.
S04E19 31 Mar 11 ★ 7.6 21m The Zarnecki Incursion 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.
S04E20 7 Apr 11 ★ 8.0 21m 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.
S04E21 28 Apr 11 ★ 7.3 21m The Agreement Dissection 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.
S04E22 5 Mei 11 ★ 7.0 21m The Wildebeest Implementation Raj attempts to cure his social anxiety disorder while Penny uses Bernadette to spy on Leonard and his girlfriend.
S04E23 12 Mei 11 ★ 7.6 20m The Engagement Reaction When Howard finally breaks the news to his mom that he's engaged to Bernadette, it lands her in the hospital.
S04E24 19 Mei 11 ★ 7.5 21m The Roommate Transmogrification When Bernadette receives her PhD, Wolowitz feels emasculated. Raj and Leonard swap places and Penny does something she's regrets.