Fenner

Fenner was a crewmember of the methane refinery on Delta III.

Biography
After a ship landed on Delta III, Fenner and his superior, Thawn, headed out to seek out the craft. They came across the craft and mistook the Fourth Doctor for gun runner, Rohm-Dutt. Realising their mistake they took him as a prisoner. Fenner and Thawn the returned to the refinery with the Doctor. As the were distracted by their machinery, the Doctor escaped.

Fenner thought the Swampies might as well be slaves, caring little for their livelihood. This afected his treatment of Mensch, who was indeed a slave. Neither Fenner not Thawn considered the Swampies to be people. (DW: The Power of Kroll)

Behind the scenes

 * Philip Madoc, a Doctor Who regular, was called in to play Fenner at the last minute. However, he had misunderstood John Nathan-Turner and thought he was playing the more substantial part of Thawn.