I t’s increasingly difficult to get people under 40—or, for that matter, anybody—out to movie theaters, but in the past few years, one genre has held consistent allure: Fantasy and fantasy-horror, movies fixated on wild scenarios and manufactured, convoluted mythologies , have become a big draw not just for young adults but also for those well into adulthood. It seems there’s no cutoff point at which it’s time to leave behind childish things. Make a movie about a grief-stricken dad and his