"[W]ould a logical creature really behave like the Cybermen do? If not, how would a logical creature really behave? Or, to put it another way, what's the "logical" way to live? That's the question I'll be examining here by contrasting the views of philosophers Thomas Hobbes, John Stuart Mill, and David Hume, asking what they'd thin of Cyberman "logic and how Cybermen might've looked if they'd been designed according to the principles espoused by these philosophers; how they might have designed the Cybermen differently, given a chance. While my examples come from Doctor Who the issue of living logically has real-world importance. After all, we all have to decide if we care about living logically or not, and if we do not want to live logically, we'd better know what "living logically" requires of us."