and he reveals her ability to shapeshift. Carlsen and SAS Colonel Colin Caine trace her to a psychiatric hospital in Yorkshire. The two believe they have managed to trap her within the heavily sedated body of the hospital's manager, Dr. Armstrong. Carlsen and Caine later learn they were deceived, as the aliens had wanted to draw them out of London. The two male vampires have survived by shapeshifting into the soldiers who killed their previous bodies, and now the pair are infecting most of London's population. As Carlsen and Caine are transporting Dr. Armstrong back to London, the female alien escapes from her sedated host and disappears. Martial law is declared as the vampire plague sweeps through the city; the victims seeking out other humans to absorb their life force and perpetuate the cycle. The absorbed life forces are channeled by the male vampires to the female vampire, who transmits the accumulated energy to their spaceship, which is now in geosynchronous orbit over London. Dr. Fallada impales one of the male vampires with an ancient weapon of "leaded iron". He contacts Carlsen and Caine and surmises that the creatures have visited Earth periodically with the coming of Halley's Comet, creating the vampire legends. He delivers the weapon to Caine before succumbing to the infection. The female vampire is tracked by Carlsen to St. Paul's Cathedral, where she is lying upon the altar, transferring energy to her spaceship. She reveals, much to Carlsen's shock, that they are a part of each other due to the sharing of their life forces, thus sharing their psychic bond. Caine follows Carlsen to the cathedral and is intercepted by the second male vampire, whom he kills. Caine throws the weapon to Carlsen, who impales himself and the female alien simultaneously. This action causes the release of a burst of energy that blows open the dome of St. Paul's. The two ascend the column of energy to the spaceship, which then returns to the comet as Caine watches. Cast Noted stage actor Patrick Connor played the Fatherly Guard, while Nicholas Donnelly played a Police Inspector, Julian Firth (no relation to Peter Firth) had an early role as Second Boy in Park, and Richard Oldfield played the Mission Leader. Production Background Lifeforce was the first film of Tobe Hooper's three-picture deal with Cannon Films, following Poltergeist in 1982, which was a collaboration with producer Steven Spielberg. The