Being from the same era as The Exorcist, This really is a proper 80's horror movie with world class acting crew, sometimes a lacking, crucial element in modern horror, I really felt like I was there in a memory gone by, this is what powerful acting is capable of, they nailed it. I am 28 years old and this shakes me up even as a horror-watching fanatic. Firstly I love how visually terrifying the alien monster is which has a slightly changed appearance throughout, the viewer benefits from a variety of monsterous gory, alien images that sear into the mind's eye. with the monsters similar properties to a virus, (more chilling with current Covid19) it can shape-shift into any human, animal or both, causing massive disruption to the scientists. The SFX department did an excellent job at making the monster as ugly as possible and dripping goo, blood and pus at every oppurtunity. Be ready for plenty of drama, distrust in each other, moments of insanity, fire and explosions, it may seem a little far fetched, but the imagination and creativity is impressive, I would go as far to say it's ahead of it's time. If you want the fright of your life, this is up there the best horror films ever made.possibly in my top 10.