- For other uses, see Demon.
A demon was a supernatural being of evil.
The Furies were the basis for demon legends on many worlds, including Earth and Qo'noS. (TOS - Invasion! novel: First Strike)
Among the Earth cultures which believed in demons were Japan (TOS novel: Home is the Hunter) and India. (TOS - The Eugenics Wars novel: The Rise and Fall of Khan Noonien Singh, Volume 2)
The Kinshaya called the Klingons demons. (ST novel: A Singular Destiny)
Lwaxana Troi, in a habit of mispronouncing things, referred to Tog as "Demon Tog", rather than stating his correct rank as DaiMon. (TNG episode: "Ménage à Troi")