Distributia
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John Wayne GacyHimself (archive footage)
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Donald W. BlackHimself - Professor of Psychology (as Dr. Donald Black)
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Ray CornellHimself
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Christopher SladeNarrator
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Helen MorrisonHerself - Forensic Psychologist (as Dr. Helen Morrison)
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David HolmesHimself - Forensic Psychologist (as Dr. David Holmes)
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David WilsonHimself - Criminologist (as Prof. David Wilson)
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David WilsonHimself - Criminologist (as Prof. David Wilson)