Puppet fun with Jake, Fizz, Milo and Bella - four loveable characters who, with their dog Doodles and their helpers Max and Judy, enjoy singing songs, telling stories and watching TV. It's snowing, and the Tweenies learn what is hot and what is cold. Max shows them icebergs and volcanoes, while Bella meets Mr Hot and Mrs Cold who sing a song to help explain the difference.