When young reporter and amateur biker Jerry Marsh investigates a mysterious hooded figure on a motorbike, he discovers crooks hiding out in a ruined castle with atomic sabotage on their minds...
Jerry Marsh
Mary Plack
Robert Plack
Martin Bremner
George Amble
Mrs. Marsh
Rakoff
Karen
Ted Lintott
Geoff Morgan
Mario
Rackton
Landlord
Elderly Lady
Holiday-Maker
Holiday-Maker's Wife
Holiday-Maker's Son
Joyce
Van Driver
