When an investigating official somberly invokes the name of Charles Manson, he inadvertently gives Manson credit for having enough taste to find this film appalling. Speaking for all humans, I strongly agree. "Forever Evil" is a marginally coherent low budget monster movie that not only features terrible acting, a dreadful script, and inept special effects, but it also succumbs to a numbingly slow pace that makes the four hours of "entertainment" featured here seem to take weeks to plow through. You may need external support to make it all the way to the end. Please drink responsibly.
The movie starts in an old cabin where several completely unlikable college friends are having an extremely lame party complete with horrid dialogue and subplots about a new invention and an unintended pregnancy. In the middle of the party, pregnant Holly (Diane Johnson) decides she can't live another minute without showering. As we all know, showering leads to murder. Holly is slaughtered in the bathroom by an unknown entity, and instead of calling the police immediately, these college graduates go hunting for the killer. The carnage that ensues leaves only Marc (Red Mitchell), Holly's ex-boyfriend alive, but hospitalized. Leo (Charles Trotter), the old crusty cop in the trenchcoat who responds to the scene says things like "It doesn't look like the head was cut off, it looks like it was pulled off". At this point you may note that you still have over an hour and a half to go. I feel for you. The film meanders over hill and dale for a while with Marc teaming up with a girl named Reggie (Tracey Huffman) who is interested in the case because she once had something similar happen to her. Whatever.
Through the magic of special effects, the evil of the title makes his first appearance as a pair of glowing red eyes in a black cowl. During the course of the investigation some creepy old witchcraft books are found, along with a story about a ceremonial dagger used for sacrifices that have been occurring for many years in a pattern only Marc understands. After a friendly black dog scares Reggie repeatedly, Marc gives the backstory about the party at the cabin. (Question: why does Marc wear a bathrobe with four stripes around the ends of the sleeves like a ship or airline Captain?) The reason for the party was to celebrate commencing the patent search for a device that Marc and his brother designed called the "Emergency Grappling System" (EGS). This thing looks like it just came off the utility belt of Batman, only it's far less plausible. Because it's such an otherwise pointless plot deviation, you know the EGS will play a crucial role later in the film.
Marc has also figured out that the evil creature kills when there is a huge pulse of energy from the "Q8 Ghost Quasar", a claim Leo is rightfully skeptical of. After zombie-Holly returns to haunt Marc with a self-Cesarean and red-eyed demonic birth scene (the special effects are beyond cut rate), Leo is killed by the evil. Marc and Reggie discover that the next Q8 quasar pulse will be "next Thursday", and engineer a plan to use themselves as bait, which, of course, succeeds. Marc astutely notices a pattern in the homicides on the map, which the trained professional law enforcement officials have not noticed despite it's being completely obvious upon first glance by anyone in the audience. Of course the pattern is a pentagram, which Marc immediately calls a "pentagon". The evil (with the worst rubber mask worn in any movie since at least 1950: think "Tales From the Crypt", only cheesy) finds the hapless duo and a lengthy rumble ensues. Obviously the EGS is employed to good effect, as is an ax, some gasoline, a gun, and the magic dagger. It sounds like it would be exciting, but don't believe it. The brawl moves to Marc and Reggie's motel room, where the now charred-to-a-crisp evil being stabs Marc with the magic dagger, although Marc turns the tables on him, and in a retaliatory strike, stabs the evil being.
So that's the end, right? So sorry, no.
It turns out that there's an immortal ghost Realtor (born in 1874) who is actually the mastermind in bringng evil back during the Q8 quasar pulses. He confronts Reggie and says things like "One of the requirements is that you die in terror, for which I really do apologize". He is quite proud of himself for recruiting Marc to be his new killer zombie. Because of their newfound and painfully expressed love, Marc saves Reggie in a startling conclusion that will surprise nobody, but is easily the best scene in the movie, as it is signals the film's end.
There are several versions of this available on DVD, and sadly mine contained both the "Director's Cut" and the "Home Video Premier Cut" as well as trailers, still photos, and a director's commentary that requires real mental toughness to get through. If you absolutely insist on seeing this film, I recommend the "Home Video Premier Cut" as it is seven minutes shorter. A better option, though, is to not watch either of them. Ever.