Guest Stars James Doohan as Lt. Cmdr. Montgomery "Scotty" Scott Nichelle Nichols as Lt. Nyota Uhura Walter Koenig as Ensign Pavel Chekov Majel Barrett Roddenberry as Nurse Christine Chapel Sarah Marshall as Janet Wallace Charles Drake as Commodore Stocker Laura Wood as Elaine Johnson Felix Locher as Robert Johnson Carolyn Nelson as Yeoman Atkins Beverly Washburn as Arlene Galway