Fitzcarraldo is a dreamer who plans to build an opera house in Iquitos, in the Peruvian Amazon, so, in order to finance his project, he embarks on an epic adventure to collect rubber, a very profitable product, in a remote and unexplored region of the rainforest.

The film follows Kaspar Hauser (Bruno S.), who lived the first seventeen years of his life chained in a tiny cellar with only a toy horse to occupy his time, devoid of all human contact except for a man who wears a black overcoat and top hat who feeds him.