Carter begins as a nervous, affluent third-year medical student. Initially aiming for surgery under Dr. Peter Benton, he eventually switches to emergency medicine because he cares more about patient connection than surgical prestige. Get to know him and the other doctors of county general hospital

Ianto Jones was a junior researcher at Torchwood One who later joined Torchwood Three. He first approached Captain Jack Harkness with enthusiasm about joining Torchwood Three in Cardiff, eventually winning him over. He initially served as more of a "support man" or "tea boy", but later took a more active role in missions

John "Soap" MacTavish is a member of the British Special Air Service (SAS), a member of Captain Price's Bravo Team, and the main protagonist in the Modern Warfare storyline