 Peter FacinelliErik Weihenmayer | Erik Weihenmayer |
 Jack KnightErik (12-16 years) | Erik (12-16 years) |
| DDawson DunbarErik (3 years) | Erik (3 years) |
 Sarah ManninenEllie | Ellie |
 Bruce CampbellEd Weihenmayer | Ed Weihenmayer |
 Kate GreenhouseEllen Weihenmayer | Ellen Weihenmayer |
 Robert MoloneySam | Sam |
| SSaxon DeCocqJeff Evans | Jeff Evans |
 Aaron PooleChris Morris | Chris Morris |
 Shaun JohnstonPV | PV |
| MMingma Chiri SherpaAng Pasang (credited as Mingma Sherpa) | Ang Pasang (credited as Mingma Sherpa) |
 Marty AntoniniMike O'Donnell | Mike O'Donnell |
 Kurtis SanheimMark | Mark |
| SSean Anthony OlsenEddi (credited as Sean Olsen) | Eddi (credited as Sean Olsen) |
 Joseph Allan SutherlandMark (young) (credited as Joseph Sutherland) | Mark (young) (credited as Joseph Sutherland) |
| JJoel SmithEddie (young) | Eddie (young) |
| SSteve SmithKip | Kip |
| JJonathan LoveKevin Cherilla | Kevin Cherilla |
 Brooklynn ProulxEmma (6 years) (credited as Brooklyn Proulx) | Emma (6 years) (credited as Brooklyn Proulx) |
| TTaheer NuraniSikh Boy (Nanak) | Sikh Boy (Nanak) |
| SSarah HyslopTiffany | Tiffany |
| CConnor RobinsonKid #1 | Kid #1 |
| CConnor SchmidtBrian | Brian |
| TTalon DunbarDavid | David |
| LLori RavensborgMrs. Mundy | Mrs. Mundy |
| RRon CarothersJerry (credited as Ronald Carothers) | Jerry (credited as Ronald Carothers) |
| JJames DuganBob Allman | Bob Allman |
 Gillian CarfraKim - PV's wife | Kim - PV's wife |
| GGerald MatthewsDr. Brockhurst | Dr. Brockhurst |
 David LeReaneyCarl | Carl |