Robert Wise
réalisateur
Harold Livingston
scénariste
William Shatner
Admiral James T. Kirk
Leonard Nimoy
Mr. Spock
DeForest Kelley
Dr. Leonard McCoy
Stephen Collins
Captain William Decker
Persis Khambatta
Lieutenant Ilia / The Probe
James Doohan
Montgomery Scott
Nichelle Nichols
Lt. Cmdr. Uhura
George Takei
Lt. Cmdr. Hikaru Sulu
Walter Koenig
Lt. Pavel Chekov
Majel Barrett
Dr. Christine Chapel
Grace Lee Whitney
CPO Janice Rand
Mark Lenard
Klingon Captain
Billy Van Zandt
Alien Boy
Roger Aaron Brown
Epsilon Technician
Gary Faga
Airlock Technician
Franklyn Seales
Crew Member
Joel Kramer
Klingon Crewman
David Gautreaux
Cmdr. Branch
John Gowans
Assistant to Rand
Howard Itzkowitz
Cargo Deck Ensign
Jon Rashad Kamal
Lt. Cmdr. Sonak
Marcy Lafferty
Chief DiFalco
Michele Povill
Lieutenant
Jeri McBride
Technician
Terrence O'Connor
Chief Ross
Michael Rougas
Lt. Cleary
Susan O'Sullivan
Woman
Ralph Brannen
Ralph Byers
Paula Crist
Iva Lane
Momo Yashima
Jimmie Booth
Dave Moordigian
Tom Morga
Tony Rocco
Joel Schultz
Craig Thomas
Edna Glover
Vulcan Master
Norman Stuart
Paul Weber
Joshua Gallegos
Security Officer
Lisa Chess
Yeoman
Leslie C. Howard
Sayra Hummel
Technical Assistant
Junero Jennings
Christopher Doohan
Extra (non-crédité)