One aspect of the film that makes it interesting is the fact that, while Lucio Fulci is listed as director, he fell ill on location and was too sick to continue shooting, despite only having completed about 60% of the film's material. The film was then completed by Bruno Mattei, and it's interesting to pick out the parts directed by each (very different) helmsman.
There are flourishes of Fulci's dry-ice swathed trademark scenes along with some typically blunt splatter, mixed together with the action movie/science fiction elements that Mattei brought to the production. The zombies have been brought into being by a man-made virus this time around (Echoing Zombie Creeping Flesh), and are screaming, running, demented maniacs mixed with the usual shambling hordes.
The conflicting styles are all too visible onscreen, not helped much by a script even more rotten than the zombies themselves, and dubbing performers that were half asleep throughout the recording. It's an interesting curio for horror fans who have a stomach strong enough for terrible films, but if you want quality, you should look elsewhere. Me? I enjoyed it for what it was- a pleasantly entertaining mess.