As the annual Giant Vegetable Competition approaches, it's "veggie-mania" in Wallace & Gromit's neighborhood. The two enterprising chums have been cashing in with their pest-control outfit, "Anti-Pesto," which humanely dispatches the rabbits that try to invade the town's sacred gardens. Suddenly, a huge, mysterious, veg-ravaging "beast" begins attacking the town's sacred vegetable plots at night, and the competition hostess, Lady Tottington, commissions Anti-Pesto to catch it and save the day. Lying in wait, however, is Lady Tottington's snobby suitor, Victor Quartermaine, who'd rather shoot the beast and secure the position of local hero--not to mention Lady Tottington's hand in marriage. With the fate of the competition in the balance, Lady Tottington is eventually forced to allow Victor to hunt down the vegetable chomping marauder. Little does she know that Victor's real intent could have dire consequences for her and our two heroes.