William Shatner as Admiral James T. Kirk

Leonard Nimoy as Captain Spock

Ricardo Montalban as Khan Noonien Singh

DeForest Kelley as Dr. Leonard 'Bones' McCoy

James Doohan as Cmdr. Montgomery 'Scotty' Scott

Walter Koenig as Cmdr. Pavel Chekov

George Takei as Cmdr. Hikaru Sulu

Nichelle Nichols as Cmdr. Uhura

Bibi Besch as Dr. Carol Marcus

Merritt Butrick as Dr. David Marcus

Paul Winfield as Captain Clark Terrell

Kirstie Alley as Lt. Saavik

Judson Scott as Joachim

Ike Eisenmann as Preston

John Vargas as Jedda

John Winston as Kyle

Paul Kent as Beach

Nicholas Guest as Cadet

Russell Takaki as Madison

Kevin Rodney Sullivan as March

Joel Marston as Crew Chief

Laura Banks as Khan's Navigator

Steve Bond as Khan's Crewman #1

Brett Baxter Clark as Khan's Crewman #2

Gilbert B. Combs as Enterprise Engineer

James Horner as Enterprise Crewman

George Sasaki as Crewmember at Spock's Funeral (uncredited)