Una helps Buddy Blank retrieve his grandson , sacrificing herself along the way for them by defending them from mutated rats .
Upon Val 's death , the Morticoccus virus enters the atmosphere , turning humans savage and animals more human - like .
Una helps Buddy Blank retrieve Val 's grandson , sacrificing herself along the way for them by defending them from mutated rats .
Upon Val 's death , the Morticoccus virus enters the atmosphere , turning humans savage and animals more human - like .