Embryo

(1976) Scientist Rock Hudson's experiments with a human fetus results in its accelerated growth into a mature adult (Barbara Carrera) in mere days. Unfortunately, Doc's accomplishment doesn't acclimate into society very well, turning homicidal and desperate to find a formula that will arrest her accelerated aging process.

[Alas! This is not one of the better-quality prints in my library. All apologies for the video/audio quality, Couch Pumpkins.]