Arthur and the Great Adventure.

When Arthur goes to stay at his grandparents' house for the holidays, he is befriended by a tribe of elfin-like miniature beings known as the Minimoys. When Arthur receives a distress call from the Minimoys, he embarks on a perilous mission to rescue their princess Selenia and her brother Betameche from the clutches of villainous wizard Maltazard in the forbidden city of Necropolis.