Duration: 22m

TV-PG 8.0 Comedy / Romance

The Big Bang Theory S4E6

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.

Release Date: October 28, 2010 (USA)

Creator: Chuck Lorre, Bill Prady

Cast: Johnny Galecki, Jim Parsons, Kaley Cuoco, Simon Helberg, Kunal Nayyar, Melissa Rauch, Mayim Bialik, Kevin Sussman, Bob Newhart