The Monster (as Karloff)
Henry Frankenstein
Elizabeth
Doctor Pretorius
Mary Wollstonecraft Shelley / The Monster's Mate
Lord Byron
Percy Bysshe Shelley
Minnie
Burgomaster
Butler
Hermit
Karl
Hans
Hans' Wife
Shepherdess (as Ann Darling)
Ludwig
Hunter in Woods (uncredited)
Archbishop (uncredited)
Baby (uncredited)
Villager (uncredited)
Gypsy (uncredited)
Neighbor with Ax (uncredited)
King (uncredited)
Lost Hunter at Hermit's Cottage (uncredited)
Procession Leader (uncredited)
Uncle Glutz (uncredited)
Ballerina (uncredited)
Gypsy's Mother (uncredited)
Gypsy's Wife (uncredited)
Rudy (uncredited)
Mother (uncredited)
Girl (uncredited)
Murdered Girl's Friend (uncredited)
Neighbor (uncredited)
Sympathetic Villager (uncredited)
Little Mermaid (uncredited)
Victim in Flashback (uncredited)
Coroner (uncredited)
Guard (uncredited)
Servant (uncredited)
Communion Girl (uncredited)
Auntie Glutz (uncredited)
Marta (uncredited)
Devil (uncredited)
Maid (uncredited)
Priest (uncredited)
Queen (uncredited)