The Big Bang Theory

The Line Substitution Solution

Series 9 - Episode 23 The Line Substitution Solution

Monday 12:40am - 1:05am E4
See Repeats
Sat 21 Dec, 11:30am - 12pm E4


Leonard’s appalling, hypercritical mother Beverly (Christine Baranski) is in town, so he coerces Penny into picking her up from the airport. This enables Penny to try to bond with her mother-in-law, while Leonard can queue for tickets for the new Avengers film. As season nine heads towards next week’s finishing line, there are no real time-bombs being primed – although Beverly’s presence is critical to the finale.

It’s a moderately entertaining episode in which queuing convention is flouted, Sheldon argues with a stranger and Stuart is shamelessly exploited by most of his friends – and doesn’t seem to mind.


Sheldon discovers a surprise screening of The Avengers is scheduled at a local cinema, complete with a Q&A session with the film's director, Joss Whedon. However, the event just happens to clash with time he'd planned to spend with Amy, so he decides to pay Stuart to be his subtitute for the afternoon while he and the other boys immerse themselves in Marvel superheroics. Meanwhile, Leonard's mother Beverly arrives in town for an extended visit, and Penny takes the opportunity to bond with her new mother-in-law - and to make up for not inviting her to the wedding. Comedy, guest starring Christine Baranski.

Cast & Crew

Leonard Hofstadter Johnny Galecki
Sheldon Cooper Jim Parsons
Penny Kaley Cuoco
Raj Koothrappali Kunal Nayyar
Amy Farrah Fowler Mayim Bialik
Bernadette Rostenkowski Melissa Rauch
Howard Wolowitz Simon Helberg
Stuart Bloom Kevin Sussman
Dr Beverly Hofstadter Christine Baranski
Trevor Blake Anderson
Ainsley Amanda Payton
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