In Belts & Gears, inhabitants of Mammoth Island are getting ready for their annual fair and are determined to make this year's event better than ever. Olive, a young islander, enlists the help of a visiting inventor to design exciting new rides, and together they decide that using belts and gears will help make the fair a success. While belts and gears don't increase the amount of force applied, they can transfer the force to change direction or speed. And this results in some terrific new rides!