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)