• Warning: Spoilers
    The 1st half was pretty good, but there are some serious plot holes.

    How exactly would carnivorous bats survive underground for millions of years?

    The writers also seriously expect us to believe that people would be starting crazy murder cults after just a few days? I cringed when the priest said "she is fertile".

    How is the power still on? Aren't power plants loud?

    It also seems completely implausible that this would be a completely world ending event. Can't you just blast loud sirens in the cities which would prevent the bats from homing in on small noises? It's also not like the bats can get through concrete.