Hubert Flynn is a 53 year-old Irish bread deliveryman in Rat. Following a night at the pub, where he's overcome by strange pains and physical sensations, Hubert returns to his home, only to turn into a rat. Hubert's wife Conchita and children Marietta and Pius are slightly taken aback, but mostly see the patriarch's new state as either a cross to bear, a tragic disease, or an opportunity for economic gain.