"The Ultimate Weapon" unites Ron Ely with former Tarzan Jock Mahoney who here plays an injured game warden.
This was the fifth and final episode filmed in Brazil. Actress Sheilah Wells stayed in Rio between May 2 and 18, 1966 recording her participation in this episode . After filming ended in May 1966, the entire crew was moved to Mexico where the rest of the series would be filmed.
Fifth and final episode of the series filmed in Brazil in May 1966. After this episode the crew moved to the outskirts of Mexico City where the remaining episodes were filmed.
Scenes with Ron Ely shot at Iguazu Falls on the Brazil-Argentina border are shown in this episode.