Swan Princess, The: Escape From Castle Mountain (aka The Swan Princess and the Secret of the Castle, 1997, U.S.A.)) 

Princess Odette, Prince Derek and their faithful animal friends are back for an all-new, musical Swan Princess adventure!

When Prince Derek attempts to rescue his mother Queen Uberta from the clutches of the evil Clavius, he discovers Clavius’ plan to steal the magic Orb hidden deep in the Prince’s castle. To stop him, Odette must use the Orb’s magical powers and once again transform into the beautiful Swan Princess. It will take all her power plus the help of her friends to save their kingdom. If they fail, Clavius will rule the enchanted land and Odette will remain a swan forever…