Deep in the jungles of Colombia, Forrest is on a mission to prove the Rio Apaporis Caiman still exists. Locals believe this crocodilian resides within a lawless land inhabited by guerilla rebels, kidnappers, and deadly predators.

In Vietnam, Forrest treks through the world's largest cave searching for the Saola in a hidden oasis. This exotic species was only recently discovered, but rumors swirl that "The Asian Unicorn" might already be extinct.