Penny
Kaley Cuoco-Sweeting
Leonard Hofstadter
Johnny Galecki
Sheldon Cooper
Jim Parsons
Howard Wolowitz
Simon Helberg
Raj Koothrappali
Kunal Nayyar
Amy Farrah Fowler
Mayim Bialik
Bernadette Rostenkowski
Melissa Rauch
Dr. V.M. Koothrappali
Brian George
Doctor
Jim Meskimen
Stuart Bloom
Kevin Sussman
Older Indian Man
Noel De Souza
Gwen
Sara Erikson
Mitchell
Tate Ellington
Janine Davis
Regina King
Dan
Stephen Root
Emily Sweeney
Laura Spencer
Wil Wheaton
Wil Wheaton
Mike Massimino
Mike Massimino
Dr. Oliver Lorvis
Billy Bob Thornton
Santa
Dakin Matthews
Security Guard
Michael Dempsey
Debbie Wolowitz (voice)
Carol Ann Susi
Mrs. Koothrappali
Alice Amter
LeVar Burton
LeVar Burton
Barry Kripke
John Ross Bowie
Stephen Hawking
Stephen Hawking
Cindy
Stephanie Escajeda
Roy
Malcolm Foster Smith
Announcer (voice) / Man / Man V.O. (voice)
Ed Lieberman
Josh Wolowitz
Matt Bennett
Chelsea
Kelli Goss
Dr. Beverly Hofstadter
Christine Baranski
Headmaster Edwards
Robert Clotworthy
Hostess
Molly Morgan
Security Guard 2
Mark Barrett
Kevin Smith
Kevin Smith
Mary Cooper
Laurie Metcalf
Nathan Fillion
Nathan Fillion
Jeanie
Kara Luiz
Photographer
Michael Reetz
Casting Assistant
Phoebe Neidhardt
Officer Hernandez
David Barrera
Alien 2
Mark Maitre
Professor Sharpe
Paul Wilson
Hostess
Angela Relucio
Caller
Rena Strober
Zombie
Max Alder
Tech Support
Matt Mittelman
Tech Support Recording
Katherine Von Till
Man
Anil Margsahayam
Alien
Jeff Jingle
Bert Kibbler
Brian Posehn
Woman
Tonja Kahlens
Man
Anil Margsahayam
President Siebert
Joshua Malina
Woman
Tonja Kahlens
Zack Johnson
Brian Thomas Smith
Older Gentleman
Robert Noble
Halley Wolowitz (voice)
Pamela Adlon
Aarti Mann
Anu
Rati Gupta
Denise
Lauren Lapkus
Althea
Vernee Watson-Johnson
Sara Gilbert
Richard Williams
Dean Norris
Mike Rostenkowski
Casey Sander
Michael J. Massimino
Michael J. Massimino
Arthur Jeffries
Bob Newhart
Claire
Alessandra Torresani
Eric Gablehauser
Mark Harelik
Wyatt Teller
Keith Carradine
Dimitri
Pasha D. Lychnikoff