Set sail with junior explorers Will and Jacklyn as they embark on a riverboat journey from Iquitos, Peru, into the Amazon Jungle with Fabien Cousteau and his crew of scientists. They are responding to rumors of a new species of giant piranha, intending to prove the piranhas' existence and determine whether they are dangerous to people living nearby. But the Amazon is estimated to be home to one-third of the world's plant and animal species, so along the way the team will also encounter dolphins, vampire bats, colorful macaws, poisonous frogs, and countless other wonders that call this great rainforest home.