In the first season, it alternated between episodes featuring the Hardy Boys (played by Parker Stevenson and Shaun Cassidy) and Nancy Drew (played by Pamela Sue Martin and later Janet Louise Johnson).

The Hardy Boys/Nancy Drew Mysteries is a television series which aired for three seasons on ABC. The series starred Parker Stevenson and Shaun Cassidy as amateur sleuth brothers Frank and Joe ...

Parker Stevenson (born Richard Stevenson Parker ... known from starring with teen heartthrob Shaun Cassidy in the The Hardy Boys/Nancy Drew Mysteries series, which ran 1977–79 on ABC-TV.