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 Captain Hikaru Sulu

Walter Koenig as Cmdr. Pavel Chekov

Nichelle Nichols as Cmdr. Uhura

Christopher Plummer as General Chang

Mark Lenard as Sarek

David Warner as Chancellor Gorkon

Kim Cattrall as Lieutenant Valeris

Rosanna DeSoto as Azetbur

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

Robert Easton as Klingon Judge

Grace Lee Whitney as Excelsior Communications Officer (Janice Rand)

Christian Slater as Excelsior Communications Officer

Jeremy Roberts as Excelsior Officer

Darryl Henriques as Nanclus

Matthias Hues as Second Klingon General

Clifford Shegog as Klingon Officer

William Morgan Sheppard as Klingon Commander

Brett Porter as General Stex

Angelo Tiffe as Excelsior Navigator

Boris Lee Krutonog as Helmsman Lojur

Tom Morga as Brute

Todd Bryant as Klingon Translator

John Bloom as Behemoth Alien

Jim Boeke as Klingon General

Michael Snyder as Crewman Dax

Denise Lynne Roberts as Bridge Background (uncredited)