This three-part series is the result of a three-year adventure in the rivers, forests, and canopy of the rainforests of Amazonia. In this episode, Journey into Amazonia, Episode 1: Waterworlds, producer Harry Marshall and crew battle the oppressive heat and hordes of insects to examine the world's mightiest river and film seldom-seen creatures and sights. The Amazon is a force that shapes the entire area. As its swollen waters ebb and flow, it affects all of the flora and fauna. This program features a close-up look at the giant otter -- a seven-foot wonder, and the boto dolphin.