Owen Watson

Professor Owen Watson was the director of the Nunton Experimental Complex. When Sarah Jane Smith broke into the complex and took Eldrad's hand into the reactor chamber, he at first assumed that she was a terrorist intent on sabotage. He was shocked to learn the truth of Eldrad's origins, and ordered a nuclear strike on the alien, but it was neutralised. He then attempted to shoot the regenerated Eldrad, but this also failed. Eldrad nearly killed Watson, but the Fourth Doctor convinced her to spare him. (TV: The Hand of Fear)

Behind the scenes
While the serial only identifies him as "Watson", the novelisation gives his first name as Owen. The reference book The Doctor: His Lives and Times further establishes that he had a daughter named Susie.