A film crew headed by anthropologist Steve Cale and director Terri Flores
journey through a river to find a mysterious Indian tribe and shoot a
documentary on them. They save a guy called Paul Sarone from a sinking
boat. He offers to help in their search for the tribe, but he is actually a snake-
hunter looking for legendary anaconda snake, and when Cale is bitten by
some tropical insect, Sarone takes over the boat.