Shaun Cassidy Joe Hardy Actor Parker Stevenson Frank Hardy Actor Ed Gilbert Fenton Hardy Actor Jack Kelly Actor Nehemiah Persoff Guest Star Pamela Franklin Guest Star Edd Byrnes Guest Star Bobby Van Guest Star John Harrison Guest Star David Gates Actor Glen A. Larson Executive Producer, Writer Michael Sloan Producer, Writer Christopher Crowe Producer Ben Kadish Producer Arlene Sidaris Producer Joyce Heft Brotman Producer Ray Austin Director