Deep in the lush jungles of the isolated Skull Island lies the habitat of the elusive, yet endangered and utterly vicious "Simian Raticus", or better known as by its common name, the Sumatran Rat-Monkey, a hideous mix of a virus-carrying slave-ship rat and a tree monkey. Presently, back in New Zealand's Wellington, the oppressed Lionel Cosgrove who lives with his despotic mother Vera, has finally found his soulmate, Paquita, but sadly, his world will rapidly change when after a stroll at the local Zoo, a live specimen of the rare species will bite Vera. Now that she's got the "bite", with the infection spreading and turning Vera into a festering, puss-squirting living dead ravenous for flesh, things are bound to get out of hand, as an ever-growing collection of stiffs and other stimulant-enhanced zombie misfits detained in Lionel's house basement will demand immediate action. Poor Lionel he needs to step up and clear up the mess, but above all, summon the courage to confront his decomposing mummy and the family's ugly secret. Will he save the day?