Guest Stars James Doohan as Lt. Cmdr. Montgomery "Scotty" Scott Nichelle Nichols as Lt. Nyota Uhura George Takei as Lt. Hikaru Sulu Walter Koenig as Ensign Pavel Chekov Majel Barrett Roddenberry as Nurse Christine Chapel Richard Compton as Technical Officer Mike Howden as Romulan Guard Joanne Linville as Romulan Commander Robert Gentile as Technician Gordon Coffey as Romulan Soldier Co Starring Jack Donner as Sub-Commander Tal