ACT I, SCENE - Prince Siegfried’s Birthday Celebration: It is Prince Siegfried’s twenty-first birthday and he is celebrating with the village children and friends. The Queen Mother arrives to give him his present, a crossbow, and reminds him that, as he is to become King, he must choose a bride at the ball the following evening. She leaves, bidding him to enjoy himself, but reminding him again to think about his royal obligation to be wed. Siegfried, realizing that his carefree days are at an end, leaves the party at the height of the festivities to seek the solace of the woods. 

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ACT I, SCENE II - The Lakeside: Prince Siegfried enters a moonlit clearing in the forest and sees a magincent swan in flight. He carefully takes aim, but, to his astonishment, the bird transforms into a breathtakingly beautiful girl, and he withdraws into the trees to observe her. Unable to resist his curiosity, he steps out, only to startle and frighten her. He assures her he will do her no harm and asks her to explain the marvel he has just seen. Impressed by his gentleness, Odette unburdens the story of her plight. She tells him she is a Princess of high birth who fell under the spell of an evil sorcerer, and now her fate is to be a swan; only in the hours of darkness may she assume her human guise. Indeed, this very lake is filled with her mother’s tears. She tells him she is condemned for eternity, and only if a virgin youth swears eternal fidelity to her and marries her can she find release. Only then can the spell be broken. But if he should forswear her, then she must remain a swan forever. At that moment the sorcerer appears. The Prince, in his passion, reaches for his crossbow, but Odette immediately protects the sorcerer with her body, for she knows that if he is killed before the spell is broken, she too will die., The sorcerer disappears, and Odette slips away into the forest. Siegfried realizes his fate is now entwined with hers. Dawn approaches and Odette is compelled by the spell to return to her guise as a swan. Siegfried is left awestruck. 
 

ACT II, SCENE I - The Ball: Heralds and trumpets announce the start of the ball. Eligible young princesses from all over the world arrive to be introduced to Prince Siegfried so that he may choose a bride. They present their national dances for the entertainment of the Prince and the Queen Mother. The prospective brides dance for them, and the Queen Mother reminds SIegfried that he must choose one for his wife. As Siegfried struggles with his responsibility to marry, his mind remains with Odette and he cannot choose. Trumpets announce an un-invited guest. It is Von Rothbart with his daughter Odile. Siegfried is seduced by her and announces his intention to marry Odile. Von Rothbart asks Siegfried to swear fidelity.. He realizes too late that he has been the victim of a terrible plot. The scene darkens; Odette is seen at the castle door, weeping. Grief-stricken, Siegfried rushes back to the lakeside. 

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ACT II, SCENE II - The Lakeside: A great storm rages. Siegfried, bursting into the glade, discovers Odette and begs her forgiveness. Odette tells Siegfried she must kill herself, or she will forever be a swan. Siegfried, knowing that his destiny is forever changed, declares he will die with her, thus breaking Von Rothbart’s power over her. As dawn approaches, Von Rothbart appears. The lovers answer his threat by throwing themselves into the lake. Von Rothbart is vanquished and his power ended.