Lifeforce-My Favorite Science-Fiction Movie

Lifeforce is a 1985 science fiction film directed by Tobe Hooper, based on the 1976 novel, The Space Vampires, by Colin Wilson. The screenplay was written by Dan O'Bannon and Don Jakoby. Featuring Steve Railsback, Mathilda May, Patrick Stewart and Christopher Jagger (Mick Jagger's brother) in acting roles, the film portrays the fictional events that unfold after three mysterious humanoids, discovered in a space shuttle, are taken to Earth.

While investigating Halley's Comet, the crew of the space shuttle Churchill finds a 150-mile long spaceship hidden in the corona of the comet. Upon entering the alien craft, the crew finds hundreds of dead, shrivelled bat-like creatures and three naked humanoid bodies (two male and one female) in suspended animation within glass coffin-like containers. The crew recovers the three aliens and begins the return trip to Earth.

During the return journey, mission control loses contact with the shuttle as it nears Earth and a rescue mission is launched to investigate. The rescuers discover that the Churchill has been severely damaged by fire, with its internal components destroyed, and the three containers bearing the aliens are all that remain intact.

The aliens are taken to the European Space Research Centre in London where they are watched over by Dr. Leonard Bukovski (Michael Gothard) and Dr. Hans Fallada (Frank Finlay). Prior to an autopsy, the female alien (Mathilda May) awakens and sucks the titular "life force" out of a guard. The female then escapes the research facility and proceeds to drain various other humans of their life force, also revealing an ability to shape-shift.It transpires that the aliens are from a race of space vampires that consume the life force of living beings, rather than their blood.

Meanwhile, in Texas, an escape pod from the shuttle Churchill is found, with Colonel Tom Carlsen (Steve Railsback) inside. Carlsen is flown to London where he describes the course of past events on the Churchill, culminating in the draining of the crew's life force. Carlsen explains that he set fire to the shuttle with the intention of saving Earth from the same fate and escaped in the pod to preserve his own life. However, when he is hypnotized, it becomes clear that Carlsen possesses a psychic link to the female alien. Carlsen and Col. Colin Caine (Peter Firth), a member of the SAS, trace the alien to the body of a nurse located at a psychiatric hospital in Yorkshire. Whilst in Yorkshire, the two believe they have managed to trap the alien within the heavily sedated body of the hospital's manager, Dr Armstrong (Patrick Stewart); but Carlsen and Caine later learn that they were deceived, as the aliens had wanted to draw the pair outside of London.

As Carlsen and Caine are transporting Dr Armstrong in a helicopter back to London, the alien girl breaks free from her sedated host and disappears. When they arrive back in London it is clear that a plague has overtaken the city — even the prime minister has been infected — martial law is enacted to secure the quarantining of London. The two male vampires, previously thought destroyed, have also escaped from confinement by shape-shifting into the forms of the soldiers guarding them; the pair then proceed to transform most of London's population into vampiric zombies.

Following contact with the male vampires, the victims cycle into "living-dead" every two hours and seek out other humans in order to absorb their life force, thereby perpetuating the zombie virus. The absorbed life force consumed by the zombies is collected by the male vampires to deliver to the female vampire, who then transfers the accumulated energy to a waiting spaceship in Earth's orbit.

Fallada manages to impale one of the male vampires with a sword made of leaded iron and surmises that the space vampire race is actually the origin of the human vampire myth. Carlsen then admits to Caine that, whilst on the shuttle, he felt compelled to open the female vampire's container and to share his life force with her. Carlsen realizes that his psychic connection is being used to lure him back to the alien so she can regain the life force shared with him earlier. She is later found lying upon a church's altar, transferring the energy from infected humans to her spaceship.

Caine follows Carlsen into the church and is intercepted by the second male vampire, whom he dispatches using the leaded iron sword obtained from Fallada (Caine was forced to kill Fallada, who had become infected with the others at the research centre). Caine relocates Carlsen but the colonel manages to impale himself and the female alien simultaneously as a sacrifice for the benefit of Earth. However, the female vampire is only wounded and returns to her ship with Carlsen in tow, releasing a burst of energy that destroys the top of the church building. The two ascend the column of light that leads to the spaceship which then returns to the comet it came from.