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The Big Bang Theory – Season 1, Episode 15: Full Cast & Crew Aired May 5, 2008 Comedy
Leonard devises a plan to eliminate his rivals when he, Wolowitz and Koothrappali all fall for Sheldon's twin sister, but his plan backfires when Sheldon decides to choose who his sister dates. TV-14 Air Date: May 5, 2008 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 Courtney Henggeler Missy Cooper Guest Star Chuck Lorre Executive Producer, Writer Bill Prady Executive Producer, Writer Lee Aronsohn Writer Mark Cendrowski Director