Wallace is voiced by Ben Whitehead in the same role, while Gromit and the returning villain Feathers McGraw remain unchanged from The Wrong Trousers. The plot centers on Wallace creating the robotic garden gnome Norbot, which Feathers hacks to carry out a diamond heist and frame Wallace, with Gromit again relying on ingenuity and loyalty to resolve the conflict.

New supporting characters such as PC Mukherjee, the Judge, and Mr Convenience appear in an organic modern UK setting and serve standard story functions without shifting focus or lore. Creator interviews and the narrative itself emphasize technology dependence, the craft of stop-motion animation, and classic villain revenge, with no references to activism, identity, or social justice. Themes of over-reliance on automation appear only as light comedic setup rather than ideological messaging. This restraint keeps the film aligned with prior entries and free of forced progressive elements that could distract from the humor and adventure.