Lieutenant John Masters
Most commonly seen as a Skydiver operative. Also one of the early SHADO recruits who helped construct SHADO HQ, and later one of the builders of a space probe to follow a UFO back to its home planet.
Actor: Jon Kelley
Episodes: Identified, Computer Affair, Flight Path, A Question of Priorities, Ordeal, The Responsibility Seat, Court Martial, Close Up, Confetti Check A-OK, Destruction