Hired by a powerful member of the Russian mafia to avenge an FBI sting that left his brother dead, the perfectionist Jackal proves an elusive target for the men charged with the task of bringing him down: a deputy FBI boss and a former IRA terrorist.

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.