Fenner

Fenner was a crewmember of the methane refinery on Delta III in the 51st century.

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

Fenner did not have a high opinion of the Swampies due to their savage nature, and thought they might as well be slaves, caring little for their livelihood. This affected his treatment of Mensch, who was indeed a slave. Nevertheless, he did not hate the Swampies, and when Thawn tried to destroy Kroll and the Swampies, Fenner was not willing to go along with Thawn until he threatened to kill him too. When Thawn then killed Dugeen for attempting to save the Swampies, Fenner was enraged by this cold-blooded act and vowed to report Thawn to the authorities.

After Thawn and Kroll were killed, the Doctor told Fenner to spend his time wisely until a rescue mission from Delta Magna arrived. (TV: 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. He agreed to the role but regretted it, feeling his character was a "non-event."