Since the great cataclysm, the Arkadians have lived deep in the centre of the Earth. Up until the day when their mysterious sun, Shagma, falls sick. They decide to send a distress call to the children on Earth, with Arkana as messenger, accompanied by Bob, Rebecca and Spartakus, underworld heroes.
Directed by: Nina Wolmark, Michel Gauthier (France, 1985)