When a fossil of an unusual creature are recovered from an uncharted jungle in South America, a small team of scientists and archeologists are sent near the waters of the Amazon to find if this beast is a mutation or an undiscovered monster. However, a living specimen of the thing, a prehistoric amphibian-like humanoid, watches them from afar, waiting for the chance to strike...until it grows an attraction towards one of the leading scientists. Is "Ricou", as the creature is soon nicknamed, cooperating with the team, or is he toying with them to get close to the leading scientist? Will any of them escape alive? And does the leading scientist show attraction to it as well?
