Sil (Species)

Sil from Species did an awful lot for the genre. Where do we even begin with her? From a DNA splicing experiment
gone wrong (don’t ask), she escaped and grew rapidly into a hot, 20-something female whose main goal was to have sex with as many virile males as possible. Were this to happen in real life, and this were how all the aliens turned out, we reckon we’d be happy to see the human race overtaken.