Atlantis: The Underwater City (2001)

During a trip to Stonehenge, two youngsters are kidnapped by a mysterious light ray coming from space. Their destination is the mythical underwater city of Atlantis where Princess Lutienne is waiting for the spacecraft. She is longing to see Zoltan, the Legendary magician. He would have helped her to rescue the town from the unwelcome invasion of the terrible aliens called Egrims. The situation is desperate: how can two young human beings face such powerful and big enemies?