Looking for the next Land of Adventure, the family balloon crashes and falls into a large crevasse. This time, they find themselves in an enchanted underground city. Their happiness is cut short however, when three mischievous mole brothers appear, steal the family map and disappear! Babar and his family run after the moles to get the map back but the moles know the underground much better than our travelers do and love playing tricks! Babar manages to save their map, but most importantly the family teaches the brothers how to keep themselves entertained and out of trouble.