Amazonia. Episode 4

Lost in the middle of the Amazon rainforest along with Brazilian Navy officer Delio, Kathy Austin did manage to establish contact with the being she came to investigate - though not for long enough to ascertain whether he's of alien origin or not, as the strange individual immediately ran off to assist the Germans about to be slaughtered by the Natives. What is his connection with those former Nazis desperately looking for a lost submarine full of gold?