Ultramarathon runners Ben Clark, Anna Frost and Tim Olson travel to Bhutan's high Himalayan landscape to try and set a speed record on the world's hardest trek.
| Actor | Role |
|---|---|
| TTim OlsonHimself | Himself |
| AAnna FrostHerself | Herself |
| BBenjamin ClarkHimself | Himself |
| CChris OrdHimself | Himself |