It's 'veggie-mania' in Wallace and Gromit's neighborhood. The two enterprising friends are cashing in with their humane pest-control outfit, "Anti-Pesto." With only days to go before the annual Giant Vegetable Competition they find that their business is booming. They come to find out that running a "humane" pest control outfit can have its drawbacks. Suddenly, a large and mysterious veg-ravaging "beast" begins attacking the town's sacred vegetable plots at night. The competition hostess, Lady Tottington, commissions Anti-Pesto to catch the beast and save the day. But Victor Quartermaine would rather shoot the beast and secure the position of local hero, not to mention Lady Tottington's hand in marriage.