Das Märchen vom Schwanensee.

Prince Frederick is supposed to choose his bride at a ball, but in the enchanted forest he meets Odette – a girl who is a swan during the day. He falls in love and wants to break the spell, so he invites her to the ball. But the sorcerer Rothbart hatches a nasty plan and sends his daughter in Odette's place. Will Frederick realise the deception in time?