Rohan Campbell
as Frank Hardy
Alexander Elliot
as Joe Hardy
Bea Santos
as Aunt Trudy
Keana Lyn
as Callie
Adam Swain
as Chet Morton
Riley O'Donnell
as Biff Hooper
Atticus Mitchell
as JB Cox
Cristian Perri
as Phil Cohen
Jennifer Hsiung
as Jesse Hooper
Linda Thorson
as Gloria
James Tupper
as Fenton Hardy (1st season)
Anthony Lemke
as Fenton Hardy (2nd season)