William Shatner
Captain James T. Kirk
Acting
Leonard Nimoy
Mr. Spock
Acting
Malachi Throne
Commodore José Mendez
Acting
DeForest Kelley
Dr. McCoy
Acting
James Doohan
Scott
Acting
Nichelle Nichols
Uhura
Acting
Sean Kenney
Christopher Pike
Acting
Hagan Beggs
Lt. Hansen
Acting
Julie Parrish
Miss Piper
Acting
Majel Barrett
Number One / Enterprise Computer (archive footage)
Acting
Jeffrey Hunter
Captain Christopher Pike (archive footage)
Acting
Susan Oliver
Vina (archive footage)
Acting
Peter Duryea
Lt. José Tyler (archive footage)
Acting
John Hoyt
Dr. Phil Boyce (archive footage)
Acting
Adam Roarke
C.P.O. Garrison (archive footage)
Acting
Laurel Goodwin
Yeoman J.M. Colt (archive footage)
Acting
Meg Wyllie
The Keeper (archive footage)
Acting
Frank da Vinci
Lt. Clifford Brent (uncredited)
Acting
Michael Dugan
The Kaylar (archive footage) (uncredited)
Acting
Sandra Lee Gimpel
Third Talosian (archive footage) (uncredited)
Crew
Clegg Hoyt
Transporter Chief Pitcairn (archive footage) (uncredited)
Acting
Bob Johnson
First Talosian / Transporter Chief Pitcairn (archive footage) (voice) (uncredited)
Acting
Edward Madden
Enterprise Geologist (archive footage) (uncredited)
Acting
Joseph Mell
Earth Trader (archive footage) (uncredited)
Acting
Eddie Paskey
Lieutenant Leslie (uncredited)
Acting
Vic Perrin
The Keeper (voice) (uncredited)
Acting
Robert Phillips
Space Officer (archive footage) (uncredited)
Acting
Janos Prohaska
Anthropoid Ape (archive footage) (uncredited)
Acting
Serena Sande
Second Talosian (archive footage) (uncredited)
Acting
Georgia Schmidt
First Talosian (archive footage) (uncredited)
Acting
Ron Veto
Harrison (uncredited)
Acting
Tom Lupo
Security Guard (uncredited)
Acting
Bill Blackburn
Lieutenant Hadley (uncredited)
Acting
Tom Curtis
Jon Daily (uncredited)
Acting
Brett Dunham
Security Chief Pitcairn (uncredited)
Acting
Jon Lormer
Dr. Theodore Haskins (archive footage) (uncredited)
Acting
Joe Evans
Survivor (archive footage) (uncredited)
Acting
Bennie Goldberg
Transporter Technician (uncredited)
Acting
Anthony Jochim
Third Survivor (archive footage) (uncredited)
Acting
Leonard Mudie
Second Survivor (archive footage) (uncredited)
Acting
Jan Reddin
Enterprise Court Recorder (uncredited)
Acting
George Sawaya
Chief Humboldt (uncredited)
Acting