Scooby-Doo and Shaggy must go into the underworld ruled by the Goblin King in order to stop a mortal named The Amazing Krudsky who wants power and is a threat to their pals, Fred, Velma and Daphne....
The plot features Eugenio, a young jeweller who in the late sixties meets Conchita on a bus in Barcelona. They instantly fall in love and he learns to play the guitar to accompany her in her music car...