- You may be looking for Michael Faraday.
Colonel Faraday was the UNIT officer in charge of the Devesham Space Defence Station while Brigadier Lethbridge-Stewart was away in Geneva. The Kraals made an android duplicate of him, as well as Harry Sullivan.
The real Faraday and Harry were freed by Sarah Jane Smith, and subsequently witnessed Styggron's death from the Kraal virus after the Fourth Doctor turned the android replica of himself against the Kraal scientist. (TV: The Android Invasion)