Greg Sutton (Inferno Earth)

The parallel version of Greg Sutton was an ex-oilman and political prisoner at the "scientific labour camp" carrying out this world's Inferno Project.

Biography
Sutton helped the Third Doctor fight off the Primords which attacked the facility and convinced Petra Williams to help. He openly defied the Brigade Leader in doing so. Sutton helped the Doctor fix his TARDIS and leave for his universe.

As his world ended, Sutton held Petra, with whom he had formed a relationship. (TV: Inferno)

By 1973, Ian Chesterton befriended Greg. (PROSE: Byzantium!)