Un joven debe parar al Señor de la Oscuridad, que intenta crear la noche eterna destruyendo al último de los unicornios y casarse con una joven princesa.
 | Paul Anderson | Albert Donoghue |
| Tom Hardy | Ronald Kray / Reggie Kray |
| Christopher Eccleston | Nipper Read |
| Joshua Hill | Scott |
 | Emily Browning | Frances Shea |
| Colin Morgan | Frank Shea |
| Tara Fitzgerald | Mrs. Shea |
| Nicholas Farrell | Dr. Humphries |
| Adam Fogerty | Pat Connolly |
| Mel Raido | Ian Barrie |
| Major John Finley | Cantante |
| Millie Brady | Joan Collins |
| Stephen Thompson | Ronnie Bender |
| Sam Spruell | Jack McVitie |
| Taron Egerton | Mad Teddy Smith |
| Alex Ferns | Mclean |
| Sam Hoare | Stefan De Faye |
 | David Thewlis | Leslie Payne |
| Christopher Adamson | Philip Testa |
 | Chazz Palminteri | Angelo Bruno |
| Alex Giannini | Tony Caponigro |
| Duffy | Timi Yuro |
| Kevin McNally | Harold Wilson |
| John Sessions | Lord Boothby |
| Nick Hendrix | Hew McCowan |
| Jane Wood | Violet Kray |
