Elle Fanning character Mary Shelley
Douglas Booth character Percy Bysshe Shelley
Bel Powley character Claire Clairmont
Stephen Dillane character William Godwin
Joanne Froggatt character Mary Jane Clairmont
Tom Sturridge character Lord Byron
Ben Hardy character Dr. John Polidori
Maisie Williams character Isabel Baxter
Hugh O'Conor character Samuel Taylor Coleridge
Ciara Charteris character Harriet Shelley
Jack Hickey character Thomas Hogg
Laurence Foster character Bookseller
Derek Riddell character William Baxter
Stuart Graham character Publisher
