The Kangaroo Who Couldn't Hop

Mrs Grey is very worried. All young kangaroos have to be presented to Big Red, the leader of all the kangaroos in the world. But what on earth is Big Red going to say about Keith? Big Red has never met a hop-less kangaroo in all his born days! He tries several ingenious ways to make Keith hop but nothing works until Keith visits the hop-spital, where the doctor suggests a very scary remedy...