Conrad John Schuck
as Klingon Ambassador
Michael Dorn
as Colonel Worf
Kurtwood Smith
as Federation President
Brock Peters
as Admiral Cartwright
DeForest Kelley
as Commander Leonard H. McCoy, M.D.
James Doohan
as Captain Montgomery 'Scotty' Scott
Walter Koenig
as Commander Pavel Andreievich Chekov
Nichelle Nichols
Mark Lenard
as Vulcan Ambassador Sarek
Grace Whitney
as Commander Janice Rand
Leon Russom
as Chief in Command
Rosanna DeSoto
as Chancellor Azetbur
Paul Rossilli
as Brigadier Kerla