Okay, so we've all been here before. From the dim old days of Captain America all the way up to "28 Days Later", we've been watching as various government programs try to genetically design the latest and greatest superhuman killing machines. Only occasionally does it actually work. "Shadow Walkers" will be one more hashmark in the huge column labeled "Really Bad Ideas". Yet another monstrously bloated government initiative (weighing out at eighty-eight billion dollars by the end), "Shadow Walkers" looks to turn people into ravenous snarling bloodthirsty superhuman beasties from hell, but at the same time, leave their brains intact enough to take orders from wildly weaker human beings. As though you needed me to tell you, Something Goes Wrong and the monsters are let out of their cages, tearing hell out of the research facility's staff.