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The Big Bang Theory is centered on five characters living in Pasadena, California: roommates Leonard Hofstadter and Sheldon Cooper; Penny, a waitress and aspiring actress who lives across the hall; and Leonard and Sheldon's equally geeky and socially awkward friends and co-workers, mechanical engineer Howard Wolowitz and astrophysicist Raj Koothrappali. The geekiness and intellect of the four guys is contrasted for comic effect with Penny's social skills and common sense.

Dean Norris

Colonel Williams

Jim Parsons

Sheldon Cooper

Johnny Galecki

Leonard Hofstadter

Simon Helberg

Howard Wolowitz

Kunal Nayyar

Rajesh Koothrappali

Melissa Rauch

Bernadette Rostenkowski

Mayim Bialik

Amy Fowler

Stan Lee

Himself

April Bowlby

Rebecca

Elon Musk

Himself

Laurie Metcalf

Mary Cooper (voice)

Sara Gilbert

Leslie Winkle

Analeigh Tipton

Vanessa Bennett

Judd Hirsch

Dr. Alfred Hofstadter

Mark Harelik

Dr. Eric Gablehauser

Rick Fox

Unknown

Mark Hamill

Himself

Brent Spiner

Brent Spiner

Joshua Malina

President Siebert

Andrew Daly

Nathan

John Ross Bowie

Barry Kripke

Bruce Holman

Airport Pedestrian

Steven Yeun

Sebastian

Brooke D'Orsay

Christy Vanderbel

Kara Luiz

Jeanie

Regina King

Janine Davis

Iris Bahr

Gilda

Pamela Adlon

Halley Wolowitz (voice)

Adam West

Himself

Eliza Dushku

Unknown

Riki Lindhome

Ramona Nowitzki

Susan Chuang

Dr. Harris

Meagen Fay

Mrs. Rostenkowski

James Hong

Unknown

Kathy Bates

Mrs. Fowler

Aaron Takahashi

Scientist

Christine Baranski

Dr. Beverly Hofstadter

Bill Nye

Himself

Robert Clotworthy

Announcer (voice)

Brian George

Dr. Koothrappali

Bob Newhart

Professor Proton - Arthur Jeffries

Margo Harshman

Alex Jensen

June Squibb

Meemaw

Brian Posehn

Bert Kibbler

DJ Qualls

Toby Loobenfeld

David Theune

Dr. Graybel

Katherine Von Till

Tech Support Recording (voice)

Michael Patrick McGill

Police Officer

Frank Alvarez

Car Thief #2

Sharon Omi

Nurse in Biohazard Suit

Blake Berris

Unknown

Max Mittelman

Tech Support (voice)

Wil Wheaton

Himself

Kal Penn

Kevin Campbell

Courtney Henggeler

Missy Cooper

George Wyner

Dr. Zhang

Iain Armitage

Young Sheldon

Tate Ellington

Mitchell

Lance Barber

George Sr.

Angela Lin

Maritza

Stephen Merchant

Dave Gibbs

Buzz Aldrin

Himself

Jennifer Hale

News Announcer (voice)

Aarti Mann

Priya Koothrappali

Jane Kaczmarek

Dr. Gallow

Sean Astin

Greg Pemberton

Lanny Joon

Officer Shin

Kimberly Brooks

Automated Cell Phone Voice (voice)

Blair Hickey

Reporter #2

Endre Hules

Russian Mission Control (voice)

Phoebe Neidhardt

Casting Assistant

Tom Yi

Dispatcher (voice)

Adam Gregor

Dmitri

Laura Spencer

Emily Sweeney

Casey Sander

Mike Rostenkowski

Sara Rue

Dr. Stephanie Barnett

Troy Winbush

Paramedic

Tucker Albrizzi

Christopher

Carol Ann Susi

Debbie Wolowitz (voice)

Bill Gates

Himself

Treisa Gary

Waitress

Elizabeth Bogush

Catherine Millstone

Talbott Lin

Chinese Leonard

Bryan Safi

Daniel

Annie O'Donnell

Mrs. Fowler

Summer Glau

Herself

Arnold Chun

Ho-Jun

Eddie Shin

Dr. Park

Marissa Cuevas

Danielle

Jim Turner

Reverend White

Joel Brooks

Professor Goldfarb

Sarayu Rao

Lalita Gupta

Ken Lerner

Dr. Schneider

Rena Strober

Caller (voice)

Brian Thomas Smith

Zack Johnson
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