Brody was an inhabitant of a colony on the Moon. He had a thing for Zara. He had been affected by the Smoke. He was more concerned about his permanent record. He was part of a collective that was against the conditions. The Fifth Doctor helped him to instigate a rebellion. (AUDIO: The Garden of Storms)
In a timeline where Zara stopped the war with the Sontarans, he was married to Wei, before he was murdered. (AUDIO: The People Made of Smoke)