Cast

Tim Matheson

Joe Hardy

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Richard Gates

Frank Hardy

Jan-Michael Vincent

Tony Prito (as Mike Vincent)

Portia Nelson

Aunt Gertrude Hardy

Ricky Kelman

Biff Hooper

Richard Anderson

Fenton Hardy

Edward Andrews

Dr Montrose

James Shigeta

George Ti Ming

Teri Garr

Susie

Crew

Larry Peerce

Director (Directing)

Richard Murphy

Adaptation (Writing)

Edward Stratemeyer

Novel (Writing)