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He also did voice work for the Jim Henson movie The Dark Crystal in 1982 as SkekUng, the Garthim master (Named "The General" in the movie), and played the part of the Green King in the 1970s serial The Moon Stallion.
It is in this book that the names of the Skeksis, the urRu, the urSkeks, and many of the creatures created in The Dark Crystal are introduced.