Exploring some of the most remote and spectacular places on Earth, five pioneering scientists make surprising discoveries that flip our understanding of nature on its head, and offer new hope for restoring our world.
| Actor | Role |
|---|---|
| MMatthieson McCraeBob Paine | Bob Paine |
| JJaime ExcellJim Estes | Jim Estes |
 Johnathan NewportJohn Terborgh | John Terborgh |
 Ashlyn Jade LopezMary Power, Age 8 | Mary Power, Age 8 |
| SSamantha NugentMary Power, Age 33 | Mary Power, Age 33 |
 Laurie SpiegelMary Power's Mother | Mary Power's Mother |
 Greg KriekTony Sinclair | Tony Sinclair |