William Shatner

James T. Kirk (voice)

Leonard Nimoy

Spock (voice)

DeForest Kelley

Leonard McCoy (voice)

George Takei

Hikaru Sulu (voice)

Nichelle Nichols

Uhura (voice)

James Doohan

Montgomery Scott (voice)

Majel Barrett

Christine Chapel / Starfleet Computer (voice)

David Gerrold

Security Ensign (voice) (uncredited)

Norm Prescott

Orion lieutenant / Orion ensign (voice) (uncredited)

Lou Scheimer

Demos / Dramian Guard (voice) (uncredited)

Stanley Adams

Cyrano Jones (voice) (uncredited)

Roger C. Carmel

Harcourt Fenton Mudd (voice) (uncredited)

Ted Knight

Vendorian / Carter Winston (voice) (uncredited)

Ed Bishop

Asmodeus (voice) (uncredited)

Mark Lenard

Sarek (voice) (uncredited)

Billy Simpson

Young Spock (voice) (uncredited)

Keith Sutherland

Young Sepek (voice) (uncredited)

Jane Webb

Lara / Vedala Female (voice) (uncredited)