The Big Bang Theory: Season 4 Episode 6: The Irish Pub Formulation
Starring: Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Carol Ann Susi
Length: 25 minutes
On Air Date: 21 Dec 2010
The Big Bang Theory: S04E06 Description: 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.