History YMMV / Species

* EvilIsSexy: Downright enforced, as the deadly alien hybrids look like supermodels in their human forms.

* StrawmanHasAPoint: Dr. Xavier Fitch says he made the alien female because he assumed she'd be more docile, which [[YouNeedToGetLaid Preston finds funny]] and [[CriticalResearchFailure is actually untrue]] as female members in Earthly predatory species tend to be more aggressive than males (it's mostly mammals who buck the trend). But by doing so they actually may have bought themselves more time, considering a female only can have one partner and reproduce more or less one by one while a male can have multiple ones at once and impregnate all of them. And considering what we see of the clearly more dangerous male hybrid in the first sequel, he turns out to be pretty close to being entirely accurate. Basically, RightForTheWrongReasons.

* IdiotPlot: Regardless of whether Sil was a failed peaceful contact between races or a wicked alien device to destroy humanity, the first film would have never happened if only Fitch and the US government had not been so extraordinarily idiotic in their handling of the Sil project. They start the chain by deciding to raise her in isolation as a lab experiment instead of a person, meaning when she does escape she has only her alien (and possibly human) instincts to tell her how to deal with the world, and those instincts tend to default to "violently." Then they try to terminate her, an experimental subject they struggled a lot to create, only because she had what in any regular little girl would be mere night terrors. They then try to do it while she is awake and painfully aware of it, even although they don't know the extent of her skills in case she tries to resist, which is why they are killing her in the first place. Then it turns out that the security of her containment chamber was non-existent, not to talk about the entire facility, which, aside from being pathetically ease to escape from, also happens to be near some train tracks that lead to a densely populated urban center! But that's not the last, as Baker later deduces they didn't even try to educate Sil in human customs and values, despite the obvious fact that her cooperation would have been desirable, if not downright vital, for their experimental goals. And finally, in order to solve the mess they have caused themselves, they just send a very small and unsupported (and judging for their attitudes, very unprepared) search team instead of calling for an official police manhunt with the pretext Sil was a female serial killer or something similar to keep the masquerade. Really, Fitch and his people weren't just incompetent: they were basically asking for humanity to be destroyed.