Leif Garrett Shaun Cassidy, The Hardy Boys/Nancy Drew Mysteries, TV, 1977-1979. Future Dynasty star Pamela Sue Martin was the girl detective and Cassidy (younger half-brother of TV  star David Cassidy) was Frank Hardy. Then the suits thought Stevenson was a better choice and switched Shaun to Joe…leading poor Leif Garret out of any Hardy  gig. Copyright © 2023 Crawley's Casting Calls. All Rights Reserved. Joomla! is Free Software released under the GNU General Public License.