Guest Stars James Doohan as Lt. Cmdr. Montgomery "Scotty" Scott George Takei as Lt. Hikaru Sulu Walter Koenig as Ensign Pavel Chekov Majel Barrett Roddenberry as Nurse Christine Chapel William Shatner as Dr. Janice Lester (in Kirk's body) Harry Landers as Dr. Arthur Coleman Sandra Smith as Captain Kirk (in Janice's body) Sandra Smith as Dr. Janice Lester Co Starring David L. Ross as Lt. Galloway Barbara Baldavin as Lt. Lisa John Boyer as Guard Uncredited James Drake as Security Guard