The film is noted for its high-energy practical effects and its unique take on the vampire mythos. Unlike traditional vampires, these beings do not drink blood; they consume the psychic energy of their victims. This creates a terrifying chain reaction where victims become shriveled "energy-vampires" themselves, leading to a massive apocalyptic scenario in the streets of London.

Tobe Hooper (famous for The Texas Chain Saw Massacre and Poltergeist ). Writer: Dan O'Bannon, who also wrote the original Alien .

Created by John Dykstra, the legend behind the effects in Star Wars .