Trevor is currently unemployed and spends his time dodging his overbearing wife by retreating to his shed at the allotment. There, he paints miniatures for wargames with his reclusive friend, Graham, and fantasizes about his brave alter-ego, Casimir the Destroyer. Trouble arises when Mr. Parsons, another allotment user, demands Trevor’s eviction due to his neglected plot (since Trevor isn’t actually gardening). This confrontation results in Trevor having a body to conceal. Unfortunately, this mishap coincides with the onset of a zombie apocalypse, and Mr. Parsons’ reanimation is just the start of Trevor’s troubles. More urgent is the dilemma of whether he should attempt to rescue his wife and her attractive best friend, both of whom he and Graham secretly admire.