Charles Kettering

Professor Charles Kettering was a scientist and 's assistant on the Keller Machine. He demonstrated its first use in Stangmoor Prison to the press, among whom was James Stevens. (PROSE: ''Who Killed Kennedy')

Kettering refused to listen to the Third Doctor's warnings about the machine's dangers, and it was while checking over the machine, shortly after the mysterious death of observer Arthur Linwood, that it killed him by turning his fear of drowning against him. His fear was so great that water manifested in his lungs. (TV: The Mind of Evil)