Frankenstein

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)