In the 1910s author Sax Rohmer created the character of Fu Manchu to exploit the racism against Asians in America. In the 1960s Christopher Lee played the character in five films with The Blood of Fu Manchu being the fourth. The movie is part exploitation (there are plenty of women in compromising positions), part racist stereotypes about Asians and Latins.
The story revolves around Fu Manchu, assisted by Lin Tang (Tsai Chin), kidnapping ten women and infecting them with an ancient poison from the Amazons that they will then transfer to others with a deadly kiss. They are to kill Fu Manchu’s greatest opponents starting with his main nemesis Nayland Smith (Richard Greene). Smith had his own aide Dr. Petrie (Howard Marion-Crawford). The two were based off of Sherlock Holmes and Dr. Watson and they acted almost exactly alike with Smith being a meticulous investigator using the smallest clues to unravel cases, while Petrie was his loyal, yet a bit bumbling ally.
That would be a straight forward story, but instead the writers decided to focus upon an adventure in the Amazon that includes a bandit named Sancho Lopez (Richardo Palacios) that ambushes a group of Fu Manchu’s men. Fu decides to send one of his poisoned women after Lopez as a result. She’s supposed to be a dancer that can seduce the ruffian, but she ends up squirming around on the ground instead. Lopez himself looks ridiculous with a silly hat that’s too small for him. When his men rape and pillage it looks like a comedy play rather than a serious act of terror. Into this mix enters Smith and Petrie trying to find Fu Manchu. That makes for a completely absurd movie.