![The Big Bang Theory Season 4 Episode 17 The Big Bang Theory Season 4 Episode 17](https://image.tmdb.org/t/p/w185/hM2TYCmOVXop1xhLA1Mbqyg60ze.jpg)
The Big Bang Theory Season 4 Episode 17
Sheldon becomes concerned when everybody begins to hang out at Raj’s apartment and discovers Leonard is the center of the group.
Serie: The Big Bang Theory
Director: Julie Fleischer, Mark Cendrowski
Guest Star: Aarti Mann, Brian Thomas Smith, John Ross Bowie, Kevin Sussman, LeVar Burton, Mayim Bialik, Melissa Rauch