Guest Stars DeForest Kelley as Dr. Leonard Horatio "Bones" McCoy Nichelle Nichols as Lt. Nyota Uhura Grace Lee Whitney as Yeoman Janice Rand Robert Walker, Jr. as Charles "Charlie" Evans Co Starring Abraham Sofaer as The Thasian Dallas Mitchell as Nellis Don Eitner as Navigator John Bellah as Crewman I Garland Thompson as Crewman II Patricia McNulty as Tina Lawton Charles Stewart as Captain Ramart