Meet Katy, a big red crawler tractor. She works very hard, in the summer fixing all of the roads with her bulldozer and in the winter helping to plow the snow. Sometimes in the winter Katy can't do much of anything because she is too strong, and there just isn't enough snow to plow. But then one day it starts to snow, and snow, and snow, and there's so much snow that all of the other plows break down. So it's up to Katy to plow out the town of Geoppolis.