Zoe Heriot

One of the Second Doctor's companions.  A former student of the Earth School of Parapsychology, which emphasized pure logic and science, at first she lacked emotions, but she overcame this during her travels with the Doctor and Jamie.   She met the Time Lord on the Wheel in Space, where she was librarian and astrophysicist, and helped him and Jamie fight the Dominators, the Cybermen (again), the Krotons, the Ice Warriors, and Caven's spcae pirates.  SHe was particularily adept with computers, as she demonstrated against the Master Brain of the Land of Fiction, the Kroton Machine, and by outsmarting Tobias Vaughn's security system.  He computerlike mind worked out the firing plan that destroyed the invading Cyberfleet.  After taking part in the War Games, Zoe was returned by the Time Lords to his own era, just after the end of her first adventure with the Doctor.  Zoe's image was used by Rassilon to ward off the Second Doctor.