This is a PBS presentation but I found the DVD at my public library. It is long at almost 2 hours but put together in a very interesting manner. It uses current actors, unseen, as voices of some of the key players, plus still photos and motion picture clips from the actual expedition.
Teddy Roosevelt was an explorer at heart, he was the youngest ever elected President at 42. He served as US President from 1901 to 1909, then attempted to get elected again in 1912. Failing to do so he took an interest in exploring part of Brazil, called the Roosevelt-Rondon Scientific Expedition. They entering the so-called River of Doubt, thought to be a tributary of the Amazon River, and with a team following it to its mouth. Roosevelt figured it would be a virtual "walk in the park" but was rudely surprised at the difficulty. At one point he injured a leg and developed an infection serious enough he was prepared to die in the Amazon.
This film is about that expedition that lasted almost 4 months. Roosevelt and his son Kermit did survive but Teddy lost 50 pounds during the ordeal and came away from it very weak. He lived less than 5 more years and died at age 60, very young for a man who had been so physically energetic over the years.
Overall a very worthwhile viewing for anyone who finds old world exploration interesting.