 | David Hewlett als Leon |
 | Cynthia Preston als Ursula |
 | Terry O'Quinn als Dr. Frank Linden |
 | Bronwen Mantel als Mrs. Linden |
 | John Pyper-Ferguson als Stan Fraker |
 | Helene Udy als Marcia Bateman |
 | Jonathan Banks als PIN (voice) |
 | Patricia Collins als Aunt Dorothy |
 | Steven Bednarski als Leon - Age 13 |
 | Jacob Tierney als Leon - Age 7 |
| Katie Shingler als Ursula - Age 11 |
 | Michelle Anderson als Ursula - Age 5 |
| Joan Austen als Nurse Spalding |
| Jamie Stern als Eddie Morris |
 | David Gow als Officer Wilson |
| Terrence Labrosse als Dr. Bell |
| Aline Vandrine als Mrs. Shaver |
| Joanna Noyes als Mrs. Henry |
| Andrew Carter als Andy |
 | Leif Anderson als Dave |
| Joel Johnson als Jack |
| Shawn Johnson als Tim |
| Robin MacEachern als Richie |
| James Quon als Boy |
| Jeremy Slaney als Boy |
| Adrian Knight als Student |
| Alan Mozes als Student |
| Marty Finkelstein als Teenager |
 | Bruce Ramsay als Teenager |
| Sandor Stern | Director |
| Rene Malo | Producer |
| Jeff Sniderman | Line Producer |
| Andrew Neiderman | Novel |
| Sandor Stern | Screenplay |
| Pierre David | Executive Producer |
| François Séguin | Art Direction |
| Stuart Aikins | Casting |
| Guy Dufaux | Director of Photography |
| Peter Manning Robinson | Original Music Composer |
| Patrick Dodd | Editor |
| Clair Blondel | Makeup Artist |
| Thierry Hoffmann | Boom Operator |
| Barbara Shrier | Production Manager |
| Karl Archambault | Assistant Unit Manager |
| Jim Begg | Supervising Producer |
| Frances Calder | Set Decoration |
| Catherine Didelot | Second Assistant Director |
| Manon Joly | Assistant Hairstylist |
| Patrick Dodd | Supervising Sound Editor |
| Nicoletta Massone | Costume Design |
| Shelly Morrow | Visual Effects |
| Patrick Dodd | Music Editor |
| Ginette Guillard | Unit Manager |
| Adam Johnston | Sound Effects Editor |
| Richard Nichol | Sound Engineer |
| Ed Fassl | Sound Effects Editor |
| Tom Ruff | ADR Mixer |
| François Séguin | Special Effects |
| Cécile Rigault | Assistant Makeup Artist |
| David Franco | Music Supervisor |
| Bob Pritchett | Hairstylist |
| Clancy T. Troutman | Supervising Sound Editor |
| René Pothier | First Assistant Director |
| Philip Rogers | Sound Recordist |
| Jeff Sniderman | Associate Producer |
| Pierre Latour | Associate Producer |
| France Boudreau | Continuity |
| Nathalie Moliavko-Visotzky | Focus Puller |
| Sylvaine Dufaux | Clapper Loader |
| Blanche Boileau | Art Department Assistant |
| Patrice Bengle | Property Master |
| Ian Lavoie | Props |
| Adam Wasserman | Art Department Assistant |
| Don Bonham | Sculptor |
| Evan Penny | Sculptor |
| Daniel Castonguay | Painter |
| Catherina Chamberland | Set Costumer |
| Caroline Bréard | Wardrobe Assistant |
| Stephan Bruno | Costumer |
| Daniel Chrétien | Gaffer |
| Maral Hassib | Best Boy Electric |
| André Shéridan | Electrician |
| Christian Lanthier | Assistant Electrician |
| Robert Lapierre Jr. | Key Grip |
| Bob Bayliss | Best Boy Grip |
| Christian Chabot | Assistant Grip |
| David Rigby | Stunt Coordinator |
| Nadia Rona | Additional Casting |
| Jennifer Jonas | Location Manager |
| Astrid Koch | Production Coordinator |
| Panos Partheniou | Production Accountant |
| Helene Lamarre | Production Secretary |
| Karl Archambault | Transportation Coordinator |
| Piroska Mihalka | Still Photographer |
| Lisa Davis | First Assistant Editor |
| Jacky Carmody | Assistant Editor |
| Lisa Davis | Assistant Sound Editor |
| Mark Berger | Sound Re-Recording Mixer |
| David Parker | Sound Re-Recording Mixer |
| Todd Boekelheide | Sound Re-Recording Mixer |
