The Big Bang Theory The Line Substitution Solution (Season 9, Episode 23)
TV-PG
TV Episode | 18 min | Comedy, Romance

Primary photo for The Line Substitution Solution

The Big Bang Theory

The Line Substitution Solution (Season 9, Episode 23)

TV-PG

TV Episode | 18 min | Comedy, Romance

Sheldon hires Stuart to spend the day with Amy when he would rather go to the movies. Meanwhile, Penny struggles to make a connection with Leonard's mother when she comes to visit.

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Cast	+ Add Cast
11 cast members

Name	Known for
Johnny Galecki Leonard Hofstadter Leonard Hofstadter See fewer	The Big Bang Theory (2007)
Jim Parsons Sheldon Cooper Sheldon Cooper See fewer	The Big Bang Theory (2007)
Kaley Cuoco Penny Hofstadter Penny Hofstadter See fewer	The Big Bang Theory (2007)
Simon Helberg Howard Wolowitz Howard Wolowitz See fewer	Florence Foster Jenkins (2016)
Kunal Nayyar Raj Koothrappali Raj Koothrappali See fewer	The Big Bang Theory (2007)
Mayim Bialik Amy Farrah Fowler Amy Farrah Fowler See fewer	Beaches (1988)
Melissa Rauch Bernadette Rostenkowski Bernadette Rostenkowski See fewer	The Big Bang Theory (2007)
Kevin Sussman Stuart Bloom Stuart Bloom See fewer	Burn After Reading (2008)
Christine Baranski Dr. Beverly Hofstadter Dr. Beverly Hofstadter See fewer	Mamma Mia! (2008)
Blake Anderson Trevor Trevor See fewer	Workaholics (2011)
Amanda Payton Ainsley Ainsley See fewer	Beginners (2010)