Episode Titles: Substitution
You are viewing a list of 2 The Big Bang Theory episodes featuring "Substitution" in their title.
The Zazzy Substitution
Season 4, Episode 3 - Aired October 7, 2010
When Sheldon and Amy argue over the importance of their respective fields, they decide to terminate their relationship. As Sheldon struggles to handle the break-up, he turns to feline companionship. Leonard gets concerned about his friend and calls in help.
The Line Substitution Solution
Season 9, Episode 23 - Aired May 5, 2016
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.