Robert Foxworth as Dr. Victor Frankenstein

Susan Strasberg as Elizabeth Lavenza

Bo Svenson as Monster

Heidi Vaughn as Agatha de Lacey

Philip Bourneuf as Alphonse Frankenstein

Robert Gentry as Henri Clerval

Jon Lormer as Charles de Lacey

William Hansen as Prof. Waldman

John Karlen as Otto Roget

George Morgan as Hugo

Brian Avery as Felix de Lacey

Willie Aames as William Frankenstein

Malila Saint Duval as Safie

Edgar Daniels as Innkeeper

Edgar Justice as Mayor

Peter Sallis as Man (uncredited)

Leif Garrett as Boy Who Runs from The Giant (uncredited)

Rosella Olsen as The Giant's Mate (uncredited)