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Fantasy writer and Theosophist Talbot Mundy titled of one his Jimgrim novels The Nine Unknown, propagating the story.
The society is mentioned several times in The Illuminatus! Trilogy and the bronze head is a resource card in the Illuminati card game.
The Nine Unknown are also mentioned in the Strugatsky Brothers’ novel A Billion Years Before the End of the World as one of the possible forces behind the mysterious intervention in scientists’ work.
Joe Pokaski and Aron Coleite cited the story of the Nine Unknown Men as an influence on the TV show Heroes in an interview.
There is a reference to the Nine Unknown Men in the song “Putta Block” by The Fall.
The fantasy fiction Legend of the 9 paid a homage to the Nine by expanding the story context into a modern setting.
La conspiración de los Idiotas, a novel by Marcos Aguinis.