Lifeforce

Lifeforce is a movie starring Steve Railsback, Mathilda May, and Peter Firth. A race of space vampires arrives in London and infects the populace, beginning an apocalyptic descent into chaos.
A space shuttle mission investigating Halley's Comet brings back a malevolent race of space vampires who transform most of London's population into zombies. The only survivor of the expedition and British authorities attempt to capture a mysterious but beautiful alien woman who appears responsible.