Viewers squeamish about the glop and guts of horror movies will be just fine. (This is more of a disaster movie than a horror film.) But if you don’t like jump scares or meditations on the ephemeral nature of every person’s life, be advised: Day One, improbably, does both.In a post-apocalyptic world, Regan and her family learn that the alien predators can be defeated using high-frequency audio. Soon, armed with this knowledge, they set out to look for other survivorsIn a post-apocalyptic world, Regan and her family learn that the alien predators can be defeated using high-frequency audio. Soon, armed with this knowledge, they set out to look for other survivors