In an exchange of information, Earth sends a message to space, hoping that there will be aliens out there to receive it. The aliens, in turn, send Earth a message about how alien DNA can be mixed with human DNA. The result of that is sex and violence in the form of an alien named Sil (Natasha Henstridge), a beauty who ends up being more like a beast. She ends up being tracked down by scientists who need to destroy her before she mates.