The Big Bang Theory - Season 9, Episode 23
  • Episode Title: The Line Substitution Solution
  • Episode Run Time: 30
  • Episode Air Date: 2016-05-05 20:00
  • Episode Summary: Sheldon hires Stuart to spend the day with Amy when he'd rather go to a movie screening. Also, Leonard's mother, Beverly, comes to town and Penny struggles to make a connection with her.