On the farm where Otis the tractor lives, it hasn't rained in a long time. One hot afternoon, Otis spots something moving down in the valley: an orange tabby cat headed straight for the old barn. But then Otis sees something else that causes his engine to sputter: a swirl of smoke coming from the same barn. A fire! Otis rushes inside to discover the source of the cat's worries: her little kittens are perched up on the hayloft, scared. Otis never hesitates, and when the floor collapses, trapping the tractor, Otis counts on his friends the fire engines.