Frankenstein's Monster's Monster, Frankenstein

David Harbour

David Harbour III / David Harbour Jr. / Frankenstein

Kate Berlant

Monica Fulton / Miss Machbeth

Alex Ozerov-Meyer

Joey Vallejo / Sal

Alfred Molina

Aubrey Fields / Captain

Michael Lerner

Bobby Fox

Mary Woronov

Nancy Erlich

Marion Van Cuyck

Niece

Lidia Porto

Detective Cepeda

Randolph Thompson

Mr. Orlando

Bridey Elliott

Reporter

O-Lan Jones

Mother

Heather Lawless

Doctor