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How's this for a really inspired and effective handy-dandy sci-fi/horror combo premise: Let's take your basic randomly selected motley assortment of everyday folks gathered together in a deep, isolated, self-contained underground nuclear fall-out shelter so they can survive an impending end-of-the-world holocaust tale and embellish on this standard situation with a borrowing from the then hip killer-animals-run-amuck trend by having a horde of vicious, relentless, chattering vampire bats with a taste for human blood attack the understandably terrified bunch at regular bloodcurdling intervals.