William Sylvester (1922-1995) was an American actor, though much of his career was spent in Great Britain. He achieved prominence in the role of Heywood Floyd in Stanley Kubrick's 2001: A Space Odyssey (1968).
- Riding with Death (Experiment #814) - as Leonard Driscoll
- Devil Doll (Experiment #818) - as Mark English
- Gorgo (Experiment #909) - as Sam Slade
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