Christopher Pike

Jeffrey Hunter

Acting

Spock

Leonard Nimoy

Acting

Number One

Majel Barrett

Acting

Vina

Susan Oliver

Acting

The Keeper

Meg Wyllie

Acting

Lieutenant José Tyler

Peter Duryea

Acting

Yeoman J. M. Colt

Laurel Goodwin

Acting

Transporter Chief Pitcairn

Clegg Hoyt

Acting

The Keeper (voice)

Malachi Throne

Acting

The Kaylar

Michael Dugan

Acting

First Talosian

Georgia Schmidt

Acting

First Talosian (voice)

Robert C. Johnson

Acting

Second Talosian

Serena Sande

Acting

Dr. Theodore Haskins

Jon Lormer

Acting

C.P.O. Garrison

Adam Roarke

Acting

Second Survivor

Leonard Mudie

Acting

Third Survivor

Anthony Jochim

Acting

Enterprise Geologist

Edward Madden

Acting

Orion Space Officer

Robert Phillips

Acting

Earth Trader

Joseph Mell

Acting

Anthropoid Ape / Humanoid Bird

Janos Prohaska

Acting

Bridge Crewmember (uncredited)

Carol Daniels

Crew