Planet A has launched a smart missile at its mortal enemy, Planet B. The missile is fitted with a warhead powerful enough to reduce Planet B to sparkly dust, as well as a highly developed artificial intelligence to operate its guidance, targeting, reconnaisance and defence systems. Planet B doesn't stand a chance. Two years pass. On Planet B (known affectionately by the locals as "Earth"), it's business as usual. So what happened to the big explosion followed by sparkly dust? The smart missile, it seems, wasn't quite smart enough. Rather than blowing up Earth, it is now living among its inhabitants - but at least it's having fun. Indeed, having called on all of its comprehensive biological and cultural databases to project itself in an acceptable humanoid form, the missile has become the ultimate blonde bombshell. The missile (now a young, beautiful and well-adjusted member of the target species) has almost forgotten its past life. Until, one day, it tries to quit smoking.