Parker Stevenson Frank Hardy Actor Shaun Cassidy Joe Hardy Actor Ed Gilbert Fenton Hardy Actor Pamela Sue Martin Nancy Drew Actor Lorne Greene Guest Star John Van Dreelen Guest Star Leon Askin Guest Star Paul Williams Guest Star Bernie Taupin Guest Star Ruth Cox Guest Star Norbert Weisser Guest Star Claude Bessy Guest Star Albert Carrier Guest Star Fritz Feld Guest Star Walter Janowitz Guest Star Norbert Schiller Guest Star Curt Lowens Guest Star Martin Kosleck Guest Star Bill Couch Jr. Guest Star Bill Catching Guest Star Felix Silla Guest Star John Bleifer Guest Star Carl Esmond Guest Star Lidia Kristen Guest Star Ben Frommer Guest Star Lawrence Levine Guest Star James Haas Guest Star Ron Hicklin Guest Star Tom Bahler Guest Star Gary Baxley Guest Star George Perina Guest Star Glen A. Larson Executive Producer, Writer Michael Sloan Writer Joseph Pevney Director