The Big Bang Theory
The Toast Derivation
Season 4, Episode 17 · Aired 2011-02-24
Synopsis
Sheldon struggles to cope when he realizes it's actually Leonard who is the center of their social group.
In the series
This episode is part of The Big Bang Theory (2007–2019) on CBS.
Nerd culture goes multi-cam prime-time global.
Key cast
- Johnny Galecki as Leonard Hofstadter
- Jim Parsons as Sheldon Cooper
- Kaley Cuoco as Penny
- Simon Helberg as Howard Wolowitz
- Kunal Nayyar as Raj Koothrappali
- Mayim Bialik as Amy Farrah Fowler