Lifeforce is a British science fictionhorror film (1985) based on the novel The Space Vampires. When a space mission involving American and British astronauts encounters an alien craft, the humanoids within are brought aboard the shuttle. Back on Earth, one of the extraterrestrials, who appears to be a gorgeous woman, proceeds to suck the life force out of various Londoners, turning the town into a city of roaming half-dead people.

The main title theme is one of Mancini’s most thrilling compositions; an aggressive, militaristic march full of rampaging string runs, heroic brass fanfares, trilling flute scales, and thundering percussion, it’s the most un-Mancini composition imaginable, but in being so emphasizes just what a brilliant and under-rated dramatic composer Henry Mancini was.