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
Carol Ann Susi
Debbie Wolowitz (voice)
Casey Sander
Mike Rostenkowski
Michael J. Massimino
Amy Tolsky
Joan
Endre Hules
Russian Mission Control (voice)
Pasha D. Lychnikoff
Dimitri
Mark Cendrowski
Director
Bill Prady
Story
Eric Kaplan
Steve Holland
Chuck Lorre
Teleplay
Jim Reynolds
Steven Molaro
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