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