Parker Stevenson Frank Hardy Actor Shaun Cassidy Joe Hardy Actor Ed Gilbert Fenton Hardy Actor Lloyd Nolan Guest Star Darleen Carr Guest Star John Colicos Guest Star Duncan Gamble Guest Star Gino Conforti Guest Star Pamela Bryant Guest Star Tanya George Guest Star Peter Weiss Guest Star Glen A. Larson Executive Producer Steven E. de Souza Writer Don McDougall Director Edward M. Abroms Director