Guest Stars James Doohan voices Lt. Montgomery "Scotty" Scott Nichelle Nichols voices Lt. Nyota Uhura George Takei voices Lt. Hikaru Sulu James Doohan voices Lt. Arex Majel Barrett Roddenberry voices Nurse Christine Chapel Majel Barrett Roddenberry voices Lt. M'Ress Uncredited Roger C. Carmel voices Harcourt Fenton Mudd