William Shatner as Kirk

Leonard Nimoy as Spock

DeForest Kelley as McCoy

James Doohan as Scotty

Walter Koenig as Chekov

Nichelle Nichols as Uhuru

George Takei as Sulu

Mark Lenard as Sarek

David Warner as Chancellor Gorkon

Kim Cattrall as Lt. Valeris

Rosanna DeSoto as Azetbur

Christopher Plummer as Chang

Kurtwood Smith as Federation President

Brock Peters as Admiral Cartwright

Paul Rossilli as Kerla

John Schuck as Klingon Ambassador

Iman as Martia

Leon Russom as Chief In Command

Michael Dorn as Klingon Defense Attorney

Grace Lee Whitney as Excelsior Communications Officer

Robert Easton as Klingon Judge

Clifford Shegog as Klingon Officer

William Morgan Sheppard as Klingon Commander

Brett Porter as General Stex

Jeremy Roberts as Excelsior Officer

Michael Bofshever as Excelsior Engineer

Angelo Tiffe as Excelsior Navigator

Boris Lee Krutonog as Helmsman Lojur

Christian Slater as Excelsior Communications Officer

Tom Morga as The Brute

Todd Bryant as Klingon Translator

John Bloom as Behemoth Alien

Jim Boeke as First Klingon General

Carlos Augusto Cestero as Munitions Man

Edward Clements as Young Crewman

Katie Johnston as Martia as a Child

Doug Engalla as Prisoner at Rura Penthe

Matthias Hues as Second Klingon General

Darryl Henriques as Nanclus

David Orange as Sleepy Klingon

Judy Levitt as Military Aide

Shakti Chen as ADC

Michael Snyder as Crewman Dax

René Auberjonois as Colonel West (uncredited)

Denise Lynne Roberts as Enterprise-A Crewmember (uncredited)