William Shatner as Captain James T. Kirk

Leonard Nimoy as Captain Spock

DeForest Kelley as Dr. Leonard 'Bones' McCoy

James Doohan as Captain Montgomery 'Scotty' Scott

George Takei as Cmdr. Hikaru Sulu

Walter Koenig as Cmdr. Pavel Chekov

Nichelle Nichols as Cmdr. Uhura

Laurence Luckinbill as Sybok

David Warner as St. John Talbot

Charles Cooper as Gen. Korrd

Cynthia Gouw as Caithlin Dar

Todd Bryant as Capt. Klaa

Spice Williams-Crosby as Vixis (as Spice Williams)

Rex Holman as J'onn

George Murdock as God

Jonathan Simpson as Young Sarek

Beverly Hart as High Priestess

Steve Susskind as Pitchman

Harve Bennett as Starfleet Chief of Staff

Cynthia Blaise as Amanda

Bill Quinn as McCoy's Father

Melanie Shatner as Yeoman

Michael Berryman as Sybok Warrior (uncredited)

Carey Scott as Young Spock