This underrated film is far from perfect, but the concepts are sufficiently ambitious to allow you to forgive their rather garbled presentation. Carpenter's script (attributed, in a nod to Nigel Kneale, to 'Martin Quatermass') is never very clear about exactly what is going on and why, and neither is his accompanying commentary track. The film uses what sounds like a rudimentary grasp of quantum physics (but then I wouldn't know) to explain the existence of Anti-God, whose son is trapped in a container secreted in the bowels of a crumbling Los Angeles church. Only now he's trying to escape so that he can bring his father from his anti-matter universe into our own by using mirrors as a portal. Trying to combine science and the history of religion in this way was never going to be easy, and Carpenter deserves some credit for trying to deal with several complex concepts within the context of what is, essentially, a low-budget siege movie. This film continues to divide the fans, but as the DVD Delirium Guide puts it, this is one of those few horror films that actually becomes scarier the more you think about it.
The Momentum Pictures DVD is the best version available of this film to date. The widescreen transfer is excellent, allowing you to fully appreciate the skill of Carpenter's compositions. This disc also improves over the old Image disc by including a commentary track by Carpenter & actor Peter Jason which, while not illuminating, is probably worth listening to once.