It's cold outside, but Nick and Sally want to keep playing. Is there a way to stay warm out in the cold? Cat's friend Lars the Lemming will know! He lives in the Wundra-Bundra-Tundra. It's cold out, but with Lars' fur coat, he doesn't even notice! They help Lars find a new home, one where there's more food for him and his family and they discover that he uses the snow to help keep him warm! Back at home the kids wear two winter coats to help them keep warm. But what's even warmer than that, hot chocolate!