The movie was shot in Argentina, where Corman had made
Deathstalker. The exterior shots were filmed in
Ischigualasto Provincial Park in
San Juan, also known as Valle de la Luna ("Valley of the Moon") for its otherworldly appearance. Most of the film was shot inside Estudios Baires Film S.A. and
Campo de Mayo, in
Buenos Aires Province. During an argument with his girlfriend before production started, David Carradine punched a wall and fractured his right hand. As a result, Carradine, who was right-handed, was trained by Anthony De Longis (who was the action and stunts coordinator, and also played the villain Kief) to learn swordfighting with his left hand. To conceal the cast on his hand, Carradine used a pointed black glove on his right arm while filming. The outfit that Carradine uses for his character of Kain is the same he later wore for the 1991
B movie/
post-apocalyptic action film Dune Warriors. In a rather obvious coincidence, Luke Askew again played the antagonist/villain role in the latter film. Carradine says the director "was obsessed by the body of the actress who played the priestess [María Socas], so he costumed her in a topless outfit. Everywhere you looked, there was this bare-breasted woman." Carradine liked the movie because of its swordplay and the fighting style he helped design, but says "don't expect a great movie" because the director quit during editing after a fight with Corman (which erupted because he had gone two weeks over schedule), meaning the editing was finished by two teams in two different countries. "It's a little uneven", said Carradine of the film. == Similarities with
Yojimbo ==