The film recreates the Roosevelt-Rondon Scientific Expedition (1913-1914), commanded by the Brazilian colonel Cândido Mariano da Silva Rondon and former US president Theodore Roosevelt. Together, they crossed the Pantanal and Amazon Rainforest to explore the mysterious Doubt River.
| Actor | Role |
|---|---|
| RRodolfo VazRondon | Rondon |
 Xando GraçaTheodore Roosevelt | Theodore Roosevelt |