Suddenly all children nine and under begin seizing then fall deep into a coma. Ten years later they awaken just as suddenly but now have a murderous agenda.
These children have a collective mind like the Borg and I always find that concept really scary. Imagine how hard it would be to hide or get away from them when they can inform the collective in an instant. The other thing about this film is that the "children" are no longer children when they awake, most of them are well into their teens which makes them a force to reckon with. I would have rated higher but I wasn't entirely happy with the explanation of the phenomena in the end. Still, it has Dee Wallace in it so there's that.