The Big Bang Theory/The Contractual Obligation Implementation

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The Contractual Obligation Implementation
Season 6, Episode 18
Airdate March 7, 2013
Production Number 3X7618
Teleplay by Steven Molaro &
Jim Reynolds &
Maria Ferrari
Story by Chuck Lorre &
Eric Kaplan &
Steve Holland
Directed by Mark Cendrowski
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The Contractual Obligation Implementation is the eighteenth episode of the sixth season of The Big Bang Theory, and the one hundred twenty-ninth episode overall.

Starring: Johnny Galecki (Dr. Leonard Hofstadter), Jim Parsons (Dr. Sheldon Cooper), Kaley Cuoco (Penny), Simon Helberg (Howard Wolowitz), Kunal Nayyar (Dr. Rajesh "Raj" Koothrappali), Mayim Bialik (Dr. Amy Farrah Fowler), Melissa Rauch (Dr. Bernadette Rostenkowski-Wolowitz)

Guest Starring: Kate Micucci (Lucy), Brian Posehn (Bert), Piper Mackenzie Harris (Girl #1)

Co-Starring: Diamond White (Girl #2), Dawson Fletcher (Justin)


Plot Overview


Arc Advancement





The Show

Behind the Scenes

Allusions and References

Memorable Moments