Genres: Documentary， Mystery

Actors: Arthur C. Clarke，Gordon Honeycombe，Arne Eggebrecht，Alex Campbell，Remy Van Lierde，Bob Gimlin，Anna Mitchell-Hedges，Kenneth Arnold，Roy Mackal，Ian Redmond，Grover Krantz，Jessie Roestenberg，Ray Stanford，Robert Rines，James Powell，Paul LeBlond，Bernard Heuvelmans，

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