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The Big Bang Theory – Season 6, Episode 21: Full Cast & Crew Aired Apr 25, 2013 Comedy
Amy tries to help Sheldon get over his compulsive need for closure when one of his favorite TV shows is canceled; Raj discovers a secret about Lucy. TV-PG Air Date: Apr 25, 2013 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 Melissa Rauch Bernadette Rostenkowski Actor Mayim Bialik Amy Farrah Fowler Actor Kate Micucci Lucy Guest Star Chuck Lorre Executive Producer, Writer Bill Prady Executive Producer, Writer Tara Hernandez Writer Steven Molaro Writer Jim Reynolds Writer Steve Holland Writer Mark Cendrowski Director