(out of 5)
|* * *|
The cardinal rule of science fiction (or at least Star Trek) is to keep the science as fiction and not try to pass it off as "real" science. This episode breaks that cardinal rule by messing around with somewhat realistic science, specifically evolution, something that I'm somewhat familiar with. Being familiar with it, I instantly realised that the writers were spouting total bullshit. Really, they should stick to the "fiction" side of things.