Tottington Hall's annual Giant Vegetable Competition is approaching. The winner of the competition will win the Golden Carrot Award. All are eager to protect their giant crops from damage and thievery by rabbits until the contest, and Wallace and Gromit are cashing in by running a vegetable security and humane pest control business, "Anti-Pesto".
However, they are faced with two problems: the first is Wallace's growing weight and the second is inadequate space for the captured rabbits. Wallace comes up with an idea — use his Mind Manipulation-O-Matic machine to brainwash the rabbits, allowing them to run freely without harming everyone's gardens. While performing the operation, he kicks the switch and something goes terribly wrong, leaving them with a semi-intelligent rabbit who (in a slow metamorphasis) starts to behave like Wallace (down to his fondness for cheese) and whom Wallace names "Hutch". Soon the town is threatened by the "Were-Rabbit", a giant rabbit-like monster which eats vegetables of any size. During a chaotic yet hilarious town meeting, Anti-Pesto enters into a rivalry with Lord Victor Quartermaine to capture the Were-Rabbit, and, to win Lady Tottington's heart. After the first night of the Were-Rabbit, the townsfolk start to argue on what to do.
After a hectic nighttime chase, Gromit discovers that the Were-Rabbit (whom he assumed was Hutch at first) is, in fact, Wallace, suffering from the effects of the accident with the Mind Manipulation-O-Matic. Victor corners Wallace during the night, jealous of Lady Tottington's growing fondness for him because of his humane practice of pest control (whereas Victor thinks it's more effective to shoot and kill them). But then Wallace falls into the path of moonlight and transforms. Victor, having identified the Were-Rabbit, goes to Reverend Clement Hedges and gains access to "24-carrot" gold bullets - supposedly, the only things capable of killing a Were-Rabbit.
During the final showdown, Victor and his dog Phillip capture Gromit, who subsequently escapes and decides to make the ultimate sacrifice by using the marrow he had been growing for the competition as bait for Wallace who, in his rabbit form, has burst in upon the vegetable contest, causing panic. Victor tries to shoot what is apparently the monster - but Gromit is one step ahead of him. Yet the marrow cannot keep Wallace's attention as Victor tries to take the golden carrot award from a distressed Lady Tottington. Wallace ascends to the rooftops, holding a screaming Lady Tottington in his hand. Discovering his identity, she promises to protect him, only to be interrupted by Victor. Meanwhile, in a mid-air dogfight in toy aeroplanes, Phillip chases after Gromit. Gromit forces his foe out of the air in a fiery crash and explosion - but Phillip manages to hold on to Gromit's plane and the two grapple. The fight rages on and in the end, Gromit releases Philip, ironically, through the bomb doors and into a bouncy castle.
Atop Tottington Hall, Gromit's toy biplane circles Wallace, who clings onto the flagpole at the top of the building for dear life. Victor, having run out of gold bullets, steals the Golden Carrot trophy and stuffs it in a blunderbuss he finds at an antique table at the fair. Victor tries one last time to shoot Wallace, but Wallace is saved by Gromit, who grabs onto a rope from a flagpole and swings his plane falls into the path of the improvised bullet. Unfortunately, since it is a toy plane not intended for flying, Gromit accidentally lets go of the rope, and begins to descend rapidly. Wallace jumps from the flagpole and catches the plane, thereby breaking Gromit's fall into the cheese tent below. Victor gloats, but is knocked unconscious by Lady Tottington, using a giant carrot. He falls into the tent too, where Wallace lies unconscious and seemingly dying of his injuries. To protect Wallace from the angry mob outside, Gromit dresses Victor up as the monster (using a marionette he used earlier as a lure for the Were-Rabbit), and throws him out of the tent. The angry mob chase Victor away.
Gromit and Tottington tend to Wallace, who seconds later, breathes his last, and morphs back into his human form. Gromit, the rabbits, and Lady Tottington are saddened by their loss, but Gromit is able to revive Wallace with a slice of Stinking Bishop cheese. Gromit, for his bravery and his "brave and splendid mellon", is awarded the (now somewhat battered) competition trophy, and Lady Tottington turns Tottington Hall into a wildlife refuge, where all the rabbits, including Hutch, can live in peace.
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