Alberto Mariscal

Upon his arrival in Rio De Janeiro to attend a convention on parapsychology, The Incredible Kaliman and his inseparable assistant Solin become involved in the most chilling adventure in the treacherous Brazilian Amazon jungle. The merciless Humanon has created a fantastic laboratory where he performs the most macabre genetic transformation. Kaliman must use his telepathic ability and physical dexterity to rescue the beautiful Guarina and a group of scientists before they are mutilated by Humanon

A group of would-be beneficiaries gather for the reading of a will, and discover that they must spend the night in a spooky castle to gain their inheritance. A spooky housekeeper and a man who seems to be a vampire are just two of the obstacles that might deter them. (imdb)

The first movie based on the comic character Kalimán.

So this female alien (which I guess is actually just an earthling from the future) goes straight up succubus on this guy. This point isn't really highlighted in the movie, but if we want to be real, that is what happens. Seven years later, she comes back and surprises him with a seven year old egg headed alien child and she wants him to teach the child how to have emotion, because the alien/human race is emotionally stunted in lieu of all their intellect. (Letterboxd)

The Kid is a vicious psychopath given to laughing a lot, an actor manqué who leads a gang of looters and rapists, and is incestuous with his father to boot. The town’s resident Mater Dolorosa, madam of the brothel, hires her lover Marcado to kill the Kid, who is of course her son.