Boris Karloff The Monster Colin Clive Henry Frankenstein Valerie Hobson Elizabeth Frankenstein Ernest Thesiger Doctor Pretorius Elsa Lanchester Mary Wollstonecraft Shelley / The Monster's Bride Gavin Gordon Lord Byron Douglas Walton Percy Bysshe Shelley Una O'Connor Minnie E. E. Clive Bürgomaster (uncredited) Lucien Prival Butler (uncredited) O. P. Heggie Hermit (uncredited) Dwight Frye Karl Reginald Barlow Hans Mary Gordon Hans' wife Anne Darling Shepherdess Walter Brennan Peasant (uncredited) John Carradine Hunter (uncredited) Michael Mark Ludwig (archive footage) (uncredited) Billy Barty Baby (uncredited) Maurice Black Gypsy (uncredited) Jack Curtis Hunter (uncredited) Torben Meyer Victim in flashback (uncredited) Boris Karloff The Monster Colin Clive Henry Frankenstein Valerie Hobson Elizabeth Frankenstein Ernest Thesiger Doctor Pretorius Elsa Lanchester Mary Wollstonecraft Shelley / The Monster's Bride Gavin Gordon Lord Byron Douglas Walton Percy Bysshe Shelley Una O'Connor Minnie E. E. Clive Bürgomaster (uncredited) Lucien Prival Butler (uncredited) O. P. Heggie Hermit (uncredited) Dwight Frye Karl Reginald Barlow Hans Mary Gordon Hans' wife Anne Darling Shepherdess Walter Brennan Peasant (uncredited) John Carradine Hunter (uncredited) Michael Mark Ludwig (archive footage) (uncredited) Billy Barty Baby (uncredited) Maurice Black Gypsy (uncredited) Grace Cunard Villager (uncredited) Jack Curtis Hunter (uncredited) Elspeth Dudgeon Gypsy's Mother (uncredited) Helen Jerome Eddy Gypsy's Wife (uncredited) Brenda Fowler Mother (uncredited) Helen Gibson Villager (uncredited) Marilyn Harris Girl (uncredited) Rollo Lloyd Neighbor (uncredited) Torben Meyer Victim in flashback (uncredited) Edward Peil Sr. Villager (uncredited) Tempe Pigott Auntie Glutz (uncredited) Dorothy Vernon Maid (uncredited) Joan Woodbury Queen Homunculus (uncredited)