When an unidentified alien destroys three powerful Klingon cruisers, Captain James T. Kirk returns to the newly transformed U.S.S. Enterprise to take command.
Admiral James T. Kirk
William Shatner
Mr. Spock
Leonard Nimoy
Dr. Leonard 'Bones' McCoy
DeForest Kelley
Cmdr. Montgomery 'Scotty' Scott
James Doohan
Lt. Cmdr. Hikaru Sulu
George Takei
Lt. Pavel Chekov
Walter Koenig
Lt. Cmdr. Uhura
Nichelle Nichols
Captain William Decker
Stephen Collins
Lt. Ilia / The Probe
Persis Khambatta
Dr. Christine Chapel
Majel Barrett
CPO Janice Rand
Grace Lee Whitney
Klingon Captain
Mark Lenard
Alien Boy
Billy Van Zandt
Epsilon Technician
Roger Aaron Brown
Airlock Technician
Gary Faga
Crew Member
Franklyn Seales
Klingon Crewman
Joel Kramer
Cmdr. Branch
David Gautreaux
Assistant to Rand
John Gowans
Cargo Deck Ensign
Howard Itzkowitz
Lt. Cmdr. Sonak
Jon Rashad Kamal
Chief DiFalco
Marcy Lafferty
Lieutenant
Michele Povill
Technician
Jeri McBride
Chief Ross
Terrence O'Connor
Lt. Cleary
Michael Rougas
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
Technical Assistant
Sayra Hummel
Technical Assistant
Junero Jennings
Klingon Crewman (as Bill McTosh)
Bill McIntosh
Enterprise Computer (voice)
Doug Hale
Enterprise Crew Member (uncredited)
David Armstrong
Crew Member (uncredited)
Richard Arnold
Enterprise Crew Member (uncredited)
Rosanna Attias
Enterprise Sciences Crew Member (uncredited)
Jerry Best
Extra (uncredited)
Christopher Doohan