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The Big Bang Theory – Season 8, Episode 21: Full Cast & Crew Aired Apr 16, 2015 Comedy
The guys fight over what message Raj should write for NASA in case of alien contact; Penny has to decide between auditioning for a movie or keeping her pharmaceutical sales job. TV-PG Air Date: Apr 16, 2015 See TV Episode Details

Cast & Crew

All Cast Crew
Johnny Galecki Leonard Hofstadter Actor Jim Parsons Sheldon Cooper Actor Kaley Cuoco Penny Actor Simon Helberg Howard Wolowitz Actor Kunal Nayyar Raj Koothrappali Actor Mayim Bialik Amy Farrah Fowler Actor Melissa Rauch Bernadette Rostenkowski Actor Sara Erikson Gwen Guest Star Kelli Goss Chelsea Guest Star Phoebe Neidhardt Casting Assistant Guest Star Mark Maitre Alien 2 Guest Voice Jeff Jingle Alien Guest Voice Chuck Lorre Executive Producer Bill Prady Executive Producer Steven Molaro Executive Producer, Writer David Goetsch Writer Steve Holland Writer Jeremy Howe Writer Eric Kaplan Writer Jim Reynolds Writer Mark Cendrowski Director