The Big Bang Theory - S4 • E10 - The Alien Parasite Hypothesis
Johnny GaleckiLeonard Hofstadter Jim ParsonsSheldon Cooper Simon HelbergHoward Wolowitz Kunal NayyarRajesh Koothrappali Melissa RauchBernadette Rostenkowski Mayim BialikAmy Farrah Fowler Brian Thomas SmithZack Johnson Steven MolaroCo-Executive Producer / Story Robinson GreenProduction Coordinator 
