 | Elle Fanning als Mary Shelley |
 | Douglas Booth als Percy Bysshe Shelley |
 | Bel Powley als Claire Clairmont |
 | Stephen Dillane als William Godwin |
 | Joanne Froggatt als Mary Jane Clairmont |
 | Tom Sturridge als Lord Byron |
 | Ben Hardy als Dr. John Polidori |
 | Maisie Williams als Isabel Baxter |
 | Hugh O'Conor als Samuel Taylor Coleridge |
 | Ciara Charteris als Harriet Shelley |
 | Jack Hickey als Thomas Hogg |
| Laurence Foster als Bookseller |
 | Derek Riddell als William Baxter |
 | Stuart Graham als Publisher |
| Emma Jensen | Writer |
| Haifaa al-Mansour | Director |
| Paki Smith | Production Design |
| Nathan Nugent | Editor |
| Ruth Coady | Producer |
| Alex Mackie | Editor |
| Alan Moloney | Producer |
| Amy Baer | Producer |
| Shane McEnroe | Set Designer |
| Kevin Downey | Set Decoration |
| Caroline Koener | Costume Design |
| Heidi Levitt | Casting |
| Katja Wolf | Casting |
| Patrick Creighton | Assistant Art Director |
| Mick Flood | Property Master |
| Amy Hubbard | Casting |
| Alice Vignoles-Russell | Assistant Art Director |
| Nigel Pollock | Supervising Art Director |
| Lorraine Glynn | Hair Designer |
| Shirley Talbot | Hairstylist |
| Erin Ayanian | Makeup Artist |
| Marc Ridremont | Art Direction |
| Haifaa al-Mansour | Writer |
| Amelia Warner | Music |
| David Ungaro | Director of Photography |
