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In page Dave Goelz:

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Goelz continued to reprise his roles as Gonzo and Bunsen in feature films, slowly adding more aspects to "the weirdo," and also worked on Henson's forays into "realistic" fantasy, The Dark Crystal (performing the Garthim Master SkekUng and the dog-like Fizzgig), and Labyrinth (playing a variety of roles, notably Sir Didymus).