The xenomorph–antagonist of the Alien film series–has a complex lifecycle. After hatching from an egg, the “facehugger” attaches itself to a host organism and implants an embryo deep within its body. Having done so, it seemingly dies. In reality, though, the creature lives on, gestating, advancing toward its next stage. Sometime later the parasite violently emerges from its carrier, then rapidly grows to enormous–and lethal–size, a near-perfect killing machine.
This reminds me of nothing so much as Dick Cheney.