| Name | Character | Episodes |
|---|---|---|
| Terry O'Quinn | Oliver Booth | 2 |
| Ian Tracey | Hector Janen | 2 |
| Peter Benson | Volcano Expert | 2 |
| Andrew Wheeler | Farmer | 2 |
| Lauren Lee Smith | Emily Booth | 2 |
| Laci J. Mailey | Katie Preston | 2 |
| Brendan Fletcher | Samuel Janen | 2 |
| Brian Markinson | Harry Stromwell | 2 |
| Brendan Penny | Eric Vascer | 2 |
| Monique Ganderton | Maple Grove Reporter | 2 |
| Janet Kidder | Ana Janen | 2 |
| Michael Vartan | Dr Matthew Cooper | 2 |
| Agam Darshi | Audrey Lee | 2 |
| Patrick Gilmore | Todd | 2 |
| Emily Holmes | Paxton Mother | 2 |
| Kwesi Ameyaw | Sgt. Dunlap | 2 |
| Michael Teigen | Official | 2 |
| Jill Teed | Jennifer Hough | 2 |
| Kirby Morrow | Engineer | 2 |
| Kurt Evans | Roadblock Driver | 2 |
| Darcy Laurie | Contractor | 2 |
| Tasha Simms | Dr. Cole | 2 |
| Andy Nez | Hank Sarland | 2 |
| Crystal Balint | Barbara | 2 |
| Greg Webb | Dr. Stanton | 2 |
| Shaker Paleja | DNR Agent | 2 |
| Leigh Bourque | Girl on bus | 2 |
| Evan Bird | Ricky | 2 |
| Aaron Brooks | Edward | 2 |
| Bart Anderson | Capsule Medic | 2 |