 | Henry Ian Cusick als Gideon Mantell |
 | Paul Brightwell als Leney |
 | Michelle Bunyan als Caroline Owen |
 | Alan Cox als Richard Owen |
| Kristian Griffiths als Walter Mantell (Aged 14-18) |
 | Derek Jacobi als Narrator (voice) |
| Rebecca McClay als Mary Anning |
 | Robert Morgan als Charles Lyell |
 | Michael Pennington als William Buckland |
 | Rachel Shelley als Mary Mantell |
| Laurie Goode als Removal Man (uncredited) |
| Andrew Piddington | Director |
| Steven Clarke | Teleplay |
| Andrew Piddington | Teleplay |
| J.C. Wilsher | Teleplay |
| Steven Clarke | Producer |
| Bill Jones | Executive Producer |
| Robert MacIver | Executive Producer |
| Andy Price | Music |
| Roger Eaton | Cinematography |
| Gail Stevens | Casting |
| David Butterworth | Orchestrator |
| Midge Ferguson | Location Manager |
| Claire Saunders | Casting Assistant |
| Alan Short | Senior Animator |
| Mike Hawkins | Steadicam Operator |
| Dan Fontaine | Best Boy Electric |
| Roger Eaton | Camera Operator |
| Mark Turner | Special Effects Supervisor |
| Simon Tomlinson | Other |
| Graham Ross | Sound Recordist |
| Will Norie | Sound Editor |
| Gary McIntyre | Sound Editor |
| Jamie Gambell | Boom Operator |
| Chris Domaille | Sound Re-Recording Mixer |
| Allan Brereton | Sound Mixer |