Robert Foxworth
Dr. Victor Frankenstein
Susan Strasberg
Elizabeth Lavenza
Bo Svenson
Monster
Heidi Vaughn
Agatha de Lacey
Philip Bourneuf
Alphonse Frankenstein
Robert Gentry
Henri Clerval
Jon Lormer
Charles de Lacey
William Hansen
Prof. Waldman
John Karlen
Otto Roget
George Morgan
Hugo
Brian Avery
Felix de Lacey
Willie Aames
William Frankenstein
Malila Saint Duval
Safie
Edgar Daniels
Innkeeper
Edgar Justice
Mayor
Peter Sallis
Man (uncredited)
Leif Garrett
Boy Who Runs from The Giant (uncredited)
Rosella Olsen
The Giant's Mate (uncredited)