| Robert Lindsay | ... | Narrator (voice) | |
| Michael Attwell | ... | William Hope | |
| Andrew Bannerman | ... | Minister | |
| John Bennett | ... | John Donovan | |
| Michael Carter | ... | John Scott Russell | |
| Ron Cook | ... | Isambard Kingdom Brunel | |
| Alexander Delamere | ... | Director | |
| Anna Farnworth | ... | Mary Brunel | |
| Fred Pearson | ... | Captain Harrison | |
| Shaun Prendergast | ... | Ned Hepworth | |
| Jonathan Salter | ... | Jack Donovan | |
| Jo Stone-Fewings | ... | William Jacomb |
| Robert Lindsay | ... | Narrator (voice) | |
| George Anton | ... | Washington Roebling | |
| Peter Banks | ... | William Marshall | |
| Steven Berkoff | ... | John Roebling | |
| Norman Chancer | ... | Dr. Andrew Smith | |
| Kenneth Jay | ... | Abram Hewitt | |
| Jeffry Kaplow | ... | Steinmetz | |
| Eric Loren | ... | Reporter | |
| Brendan McNamara | ... | Frank Harris | |
| Johnny Myers | ... | Doctor | |
| Shane Rimmer | ... | William Kingsley | |
| Donald Sumpter | ... | Farrington | |
| Debora Weston | ... | Emily Roebling |
| Robert Lindsay | ... | Narrator (voice) | |
| Anthony Allen | ... | Lighthouse Worker | |
| James Brown | ... | Lighthouse Worker | |
| Emma Busby | ... | Stevenson's Daughter | |
| David Buyler | ... | Lighthouse Worker | |
| Robert Cavanah | ... | Robert Stevenson | |
| Jean Marie Coffey | ... | Jean Stevenson | |
| Ken Drury | ... | James Glen | |
| James Gillan | ... | James Scott | |
| John Kane | ... | Commissioner | |
| Michael Kenny | ... | Lighthouse Worker | |
| Rod Mathew | ... | Wishart | |
| Bruce McGregor | ... | Charles Henderson | |
| Michael Moreland | ... | Henry Dickson | |
| David Robb | ... | John Rennie | |
| Chloe Robertson | ... | Stevenson Twin | |
| Johnny Robertson | ... | Stevenson Twin | |
| Malcolm Shields | ... | James Dove | |
| Alfie Wellcoat | ... | Alexander Scott |
| Robert Lindsay | ... | Narrator (voice) | |
| Lorenzo Baca | ... | Porcupine | |
| Al Cacioppo | ... | Engineer | |
| Mark Camaren | ... | Charlie Crocker | |
| Ricky Culbertson | ... | Thompson | |
| Marcus D'Amico | ... | Grenville Dodge | |
| Peter Dey | ... | Eric Usher | |
| David Fine | ... | William T. Sherman | |
| Justin Gross | ... | Theodore Judah (as Justin M. Gross) | |
| Richard Gross | ... | James Harvey Strobridge | |
| Tim Halpin | ... | General Jack Casement (as Timothy Halpin) | |
| Charlie Holliday | ... | Kinney | |
| Bob Sáenz | ... | Leland Stanford (as Robert Saenz) | |
| Nick Scoggin | ... | Henry Poor | |
| Richard Silberg | ... | William Ratcliffe | |
| Meaghan Sinclair | ... | Woman #2 | |
| Kirk Uhler | ... | Charles Adams | |
| Dennis Yap | ... | Chinese Headman | |
| Robert Young | ... | Thomas Durant |
| Robert Lindsay | ... | Narrator (voice) | |
| Joseph Bazalgette | ... | Mudlark | |
| Louis Bazalgette | ... | Mudlark | |
| Deagaln Brennan | ... | Bazalgette Child | |
| Julian Brewer | ... | Cholera Patient | |
| David Dale | ... | Foreman | |
| John Fearman | ... | House of Commons Attendant | |
| Charlie G. Hawkins | ... | Mudlark (as Charlie Hawkins) | |
| Max Hodgkins | ... | Bazalgette Child | |
| Evan Hoskins | ... | Bazalgette Child | |
| Ben Kinsella | ... | Mudlark | |
| Gary Lammin | ... | Barker | |
| Norman Lovett | ... | William Farr | |
| Catherine Mack | ... | Maria Bazalgette | |
| Richard Manlove | ... | Bricklayer | |
| Mark McGann | ... | Joseph Bazalgette | |
| Liam Nolan | ... | House of Commons Attendant | |
| Pip Torrens | ... | Dr. John Snow | |
| Sam Troughton | ... | H Percy Boulnois | |
| Martyn Whitby | ... | Edwin Chadwick (as Martin Whitby) | |
| Peter Whittington | ... | Prince of Wales | |
| Mark York | ... | MP |
| Robert Lindsay | ... | Narrator (voice) | |
| Cora Branley | ... | Louise-Helene de Lesseps | |
| Daniel Coonan | ... | Philippe Buñau-Varilla | |
| Claudette de Miller | ... | Fever Victim's Mother | |
| Jeff Harding | ... | John Stevens | |
| Tara Hugo | ... | Marie Gorgas | |
| Robert Jezek | ... | Dr. William Gorgas | |
| Angus MacInnes | ... | Colonel George Goethals | |
| Stephen Mangan | ... | Jules Isidore Dingler | |
| Corine Ricau | ... | Sister Marie Rouleau | |
| John Walters | ... | Ferdinand de Lesseps |
| Robert Lindsay | ... | Narrator (voice) | |
| Erik J. Anderson | ... | Frank Anderson | |
| Jay Benedict | ... | Frank Crowe | |
| Scott Clark Beringer | ... | Glenn 'Bud' Bodell | |
| John Smith Burnside | ... | City Official | |
| Ken Byler | ... | Judge | |
| Andrew Fulton | ... | Louis Fagan, Highscaler | |
| Karen Coover Gay | ... | Emma Godbey, Rag Town Woman | |
| John Guerrasio | ... | Marion Allen, Dam Worker | |
| Del Guidice | ... | Reporter (as Scott Del Guidice) | |
| Andrew Henderson | ... | Reporter | |
| Chris Jenkins | ... | Company Doctor (as Christopher Jenkins) | |
| Tim McNamara | ... | Worker | |
| Bill Michaels | ... | Ed Kraus | |
| Colin Stinton | ... | Walker 'Brig' Young | |
| Kalena Von Schnier | ... | Prostitute | |
| Gary Webb | ... | Leonard Blood, Recruiting Officer |
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