"All the world will be your enemy, Prince with a Thousand Enemies, and whenever they catch you, they will kill you. But first they must catch you, digger, listener, runner, prince with the swift warning. Be cunning and full of tricks and your people shall never be destroyed." So begins the classic children's tale Watership Down. Based on a novel of the same name, Watership Down became an animated classic in 1978, and 40 years later, the BBC is bringing it to a new audience in computer-animated form.