The Big Bang Theory: Season 4, Episode 6

The Irish Pub Formulation (28 Oct. 2010)

TV Episode  -   -  Comedy
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Leonard tries to keep everyone from finding out that he spent the night with Raj's sister, but Sheldon finds out and concocts an elaborate story to help him keep the secret from Raj.



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The Irish Pub Formulation (S4, Ep6)

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The Irish Pub Formulation (S4, Ep6)

Mon Apr. 28, 7:00 PM Fox (002)

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Episode complete credited cast:
Penny (credit only)


Raj's sister, Priya, a corporate lawyer, has a 24 hour layover in Los Angeles on her way to Toronto on a work trip. When the guys met her the first and only time five years ago when she last was in Los Angeles, Howard and Leonard made a "pinky swear" pact not to hit on her, much to Raj's pleasure as he wanted and still wants to protect his little, innocent sister. Priya ends up not being so innocent as she wants to have a casual fling with Leonard on this trip, he who complies and would actually want it to be more than just casual. When Sheldon catches Priya in their apartment when she shouldn't be there, Sheldon devises an elaborate but totally implausible alibi for Leonard in the probability - at least in Sheldon's mind - that Raj and or Howard will ask. This incident brings up the issue of betrayal amongst the four friends. Written by Huggo

Plot Summary | Plot Synopsis

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Release Date:

28 October 2010 (USA)  »

Company Credits

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Technical Specs

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Aspect Ratio:

16:9 HD
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Did You Know?


This show introduces Priya Koothrappali and her dating Leonard. See more »


Raj asks if the guys had seen the latest episode of Caprica (2009), which always aired at 10 PM. It had been established earlier during the sneaking of Priya into the apartment that it was sometime after 9 PM and Raj was already asleep. See more »


Priya Koothrappali: I could never bring a white boy home to my parents. They'd have a cow - which is a much bigger deal in India.
See more »


References The Lord of the Rings: The Two Towers (2002) See more »


Big Bang Theory Theme
Composed and Performed by Barenaked Ladies
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User Reviews

8 February 2011 | by (Joinville, Brazil) – See all my reviews

What a nice episode. It is basically about Raj's sister coming for a visit and his brother telling nobody is allowed to get laid with her. She flirts with Leonard and he tries to sleep with her without Sheldon seeing it, but as always, Sheldon ruins it all. So Leonard asks him to keep this as a secret, and whey the four geeks are gathered, Leo ends up telling the truth to Raj. So the geeks begin to tell some bad things they've made to each other behind their backs, and everyone apologizes, except Sheldon the headstrong. There are many funny jokes throughout the episode and we get to laugh at almost all of them. This is another classic episode with Sheldon long quotes and the geeks having to deal with all of his habits.

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