The Big Bang Theory - Season 4 - Eps 14: The Thespian Catalyst
Hoping it will make him a better teacher, Sheldon has Penny give him acting lessons. Raj has fantasies about a friend's girlfriend.
About The Big Bang Theory

Title: The Big Bang Theory
First Air Date: 2007-09-24
Last Air Date: 2019-05-16
Status: Ended
Rating: 7.9/10 (from 11562 votes)
Language: EN
Seasons: 13
Total Episodes: 279
Network: CBS
Genres: Comedy
Production Companies: Chuck Lorre Productions, Warner Bros. Television
Synopsis
Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.
Cast

Johnny Galecki
Leonard Hofstadter

Jim Parsons
Sheldon Cooper

Kaley Cuoco
Penny

Simon Helberg
Howard Wolowitz

Kunal Nayyar
Rajesh Koothrappali

Melissa Rauch
Bernadette Rostenkowski

Mayim Bialik
Amy Farrah Fowler