The Big Bang Theory/The Line Substitution Solution

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The Line Substitution Solution
Season 9, Episode 23
Airdate May 5, 2016
Production Number 4X7223
Teleplay by Steven Molaro &
Eric Kaplan &
Maria Ferrari
Story by Steve Holland &
Saladin K. Patterson &
Tara Hernandez
Directed by Anthony Rich
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The Big Bang TheorySeason Nine
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The Line Substitution Solution is the twenty-third episode of the ninth season of The Big Bang Theory, and the two hundred sixth episode overall.

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

Special Guest Star: Christine Baranski (Beverly)

Guest Starring: Blake Anderson (Trevor)

Co-Starring: Amanda Payton (Ainsley)


Plot Overview


Arc Advancement





The Show

Behind the Scenes

Allusions and References

Memorable Moments