Season 4, episode 17: The Big Bang Theory (2007)

The Big Bang Theory (2007)

TV series 279 episodes 12 seasons

TV-PG 22 minutes EN Comedy

Smart is the new sexy.

Physicists Leonard and Sheldon find their nerd-centric social circle with pals Howard and Raj expanding when aspiring actress Penny moves in next door.

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Season 4, episode 17

Premiere: Feb 24, 2011

The Toast Derivation

Sheldon becomes concerned when everybody begins to hang out at Raj's apartment and discovers Leonard is the center of the group.

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Cast in this episode:

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

Guests in this episode:

Kevin Sussman

Stuart Bloom

Aarti Mann

Priya Koothrappali

John Ross Bowie

Barry Kripke

LeVar Burton

Brian Thomas Smith

Zack Johnson