Osgood joined UNIT shortly before the Third Doctor's arrival, as a corporal. He was the most technically proficient UNIT soldier, having attended universities, where he studied scientific subjects, although he admitted that he was out of his depth where the Doctor and Liz Shaw were concerned. (PROSE: The Eye of the Giant) Soon after this, Osgood became engaged to a woman named Becky, whom he met at a folk festival. (PROSE: Dancing the Code) In 2001, Osgood was a civilian in his fifties. He was brought in to help UNIT and the Sixth Doctor with an alien incursion. (PROSE: The Shadow in the Glass)