Sam Bishop

 was a member of UNIT. Though he came from a family of bookeepers and teachers, Sam was inspired to join the military as a child by his great-grandfather, who would regale him with stories of when he fought with the Eighth Army in North Africa during World War II, serving in battlefronts such as El Alamein, Tobruk, and Gazala. He often went on dangerous missions. Kate Stewart sent him on a mission to the Gobi Desert to track an Energy unit. On this mission a set of Autons attacked him. He was then sent to Puerto Rico to track the Nestene energy units landing. (AUDIO: Earthfall) He sent Kate and Colonel Shindi to Black Archive 5, as there was something useful in the vault. (AUDIO: Armageddon)