sentences:  In an unnamed South American nation, a man escapes from prison into the jungle, where he is attacked by an unseen assailant and has much of his face torn off.Anthropologist Evelyn Howard (Deborah Raffin) decides to look for Dr. Eslinger, a colleague who went missing in the same jungle while searching for the Duende—a rumored tribe of dwarfish, winged reptiloids (reptile-like people).She hires alcoholic helicopter pilot Harry Bediker (Peter Fonda) to fly her into the jungle.