Resident Evil (2002)
Stephen Billington: Mr. White
Red Queen : Even in death the human body still is active. Hair and finger nails continue to grow, new cells are produced, and the brain itself holds a small electrical charge that takes months to dissipate. The T-virus provides a massive jolt, both to cellular growth, and to those trace electrical impulses. Put quite simply, it reanimates the body.
Rain : It brings the dead back to life?
Red Queen : Not fully. The subjects have the simplest of motor functions. Perhaps a little memory, but virtually no intelligence. They're driven by the basest of impulses, the most basic needs.
Mr. White : Which is?
Red Queen : The need to feed.