Abraxas: Guardian of the Universe/Doctor Strain the Body Snatcher

In Abraxas, Guardian of the Universe (1990), an alien "policeman" arrives on Earth to apprehend a renegade of his own race who impregnates a woman with a potentially destructive mutant embryo. In Doctor Strain The Body Snatcher (1991), a man turns to his nephew to help continue his experimental work in reanimation since he is nearing death due to years of chemical poisoning.