(1974) and The Hardy Boys/Nancy Drew Mysteries (1978), and performed many lucrative television commercial voice-overs.

The Hardy Boys/Nancy Drew Mysteries (2 episodes, 1977)

In the television series The Hardy Boys/Nancy Drew Mysteries (1977-1979), Bess was played by Ruth Cox.

He is well-known as Fenton Hardy on 1970s television's The Hardy Boys/Nancy Drew Mysteries.

The Hardy Boys/Nancy Drew Mysteries - Jill Sommers (1 episode, 1978)

In the television series, The Hardy Boys/Nancy Drew Mysteries, the story is completely rewritten.

The Hardy Boys/Nancy Drew Mysteries (1978)

The Hardy Boys/Nancy Drew Mysteries (1977-79)

Cassidy's popularity continued with the concurrent arrival of his television series, The Hardy Boys/Nancy Drew Mysteries, which also starred Parker Stevenson.

The Hardy Boys/Nancy Drew Mysteries (1 episode, 1977)