Katy, a red crawler tractor, belonged to the Highway Department of the City of Geoppolis. She was not used in winter, however, until a huge snow storm snowed in the whole city. Then Katy plowed out everyone.
When a big new yellow tractor arrives, Otis the friendly little tractor is cast away behind the barn, but when trouble occurs Otis is the only one who can help. On board pages.
When a puppy gets lost while playing hide and seek on the farm, Otis the friendly little tractor must face his fear of the darkness in order to help his new friend.