The Borribles, across the dark metropolis

In a hidden world beneath London's streets, the Borribles, a race of small, wild children with pointed ears, face an existential threat from the adult world. When their home is discovered, a band of young Borribles embarks on a perilous journey across the city to find a new, safe haven. They must outwit humans and other dangers in a desperate fight for their survival and freedom.