Here is where you will find a synopsis of the story. Script on the way.
Summary
The story begins with the grand finale of Halloween Town's Halloween celebration, which is hailed by the return of Jack Skellington, the Pumpkin King. When Jack sneaks away from the adoring citizens, it is revealed that he is tired of the same old Halloween routine. He wonders off to the Graveyard to lament over his unfulilled desires, which is heard by Sally, hiding behind a tombstone. Sally understands how Jack feels but he enters the Hinterlands with Zero before she reveals herself.
Accidentally sleepwalking through the Hinterlands, Jack stumbles upon a place in the forest he has never been before. What he finds is a grove of trees with colorful doors leading to other Holiday Worlds. Jack is drawn toward the Christmas door and opens it, finding Christmas Town. Inspired by and infatuated with the holiday, he attempts with little success to explain it to the citizens of Halloween Town. After obsessively researching it, he decides that this year the citizens of Halloween Town will manage Christmas, in the hopes of "improving" it. Sally on the other hand, has a premonition that his plans for Christmas will be a disaster. She attempts to warn him, but Jack is too wrapped up into "his" Christmas to recognize her warnings and politely dismisses her fear.
Sally's premonition proves to be right: Not really understanding the "spirit" of Christmas, the citizens of Halloween Town create a celebration of the macabre rather than of joy. Jack, dressed as Santa Claus ("Sandy Claws" as Jack calls him) unintentionally brings terror rather than joy to the children of the world. Wanting "Sandy Claws" to rest, Jack had ordered a trio of trick-or-treaters, Lock, Shock, and Barrel, to bring Santa to Halloween Town. However, after Santa is first brought to Jack and greeted warmly by him, the three take him to their master, Oogie Boogie, who mocks, tortures, and plans to eventually kill Santa with his sadistic games. Sally attempts to rescue Santa Claus after discovering that military forces are planning to defeat Jack, but she is captured too. Upon realizing the error of his ways, Jack overcomes his identity crisis and reaffirms himself as the Pumpkin King.
Determined to set things right, Jack returns to Halloween Town, where he discovers that Santa has been taken to Oogie's Lair and that Sally is also there. He manages to rescue Santa and Sally, and defeat Oogie Boogie. Santa Claus returns to the real world to save Christmas and, as a sign of no hard feelings, gives Halloween Town a taste of true Christmas spirit, fulfilling Jack's former desire to a limited extent. Jack also finds Sally on the Spiral Hill blanketed in snow and reveals his own affection for her. At the film's end, the two embrace and share a kiss while Zero looks on.