It's hard to know where to start. Hellgate is a hella-mess. The sound editing and balance are way off. The story within a story framework seems totally lame and overdone, mostly because of bad actors who set up the story. The segment that takes place in the 1950's has so many time period inconsistencies that it's laughable.
But, hey, Hellgate has Ron Palillo as it's main star! For those who have no idea who Palillo is, he played Horshack on the 1975 series Welcome Back Kotter. All I can say is that he was better in the series than he is in this movie and that's not much of a compliment.
Then let's talk about special effects. The "bat on a string" belongs in a 1930's movie. The "muppet from hell" zombie goldfish is laugh out loud funny. Then there is the "fashion model zombie" who is brought back from the dead after 30 years with hair and make up intact. The rest of the undead are fairly well preserved as well. Obviously, they forgot to budget some money for a simple make up kit from the Halloween Superstore! Where is Tom Savini when you need him? [Some zombies actually do appear toward the end of the film but it feels like too little, too late.]
I could summarize the plot but, at this point, who cares. It's all been done before and done sooooo much better. Skip this one and let it rot in bottom of the bargain video bin for all eternity. RIP.
For more info check out the film's entry in IMDB.