Halloween Town
Jack, the pumpkin king of Halloween Town, worked with Dr. Finkelstein and created a heart to control the Heartless for the Halloween festival.
Oogie Boogie, plotting to use the heart to take over Halloween Town, had Lock, Shock and Barrel steal it.
When Sora and company arrived at his manor, Oogie Boogie tried to summon a swarm of Heartless with the heart, but failed. Evidently, the heart was incomplete
After Sora and his friends defeated him, Oogie Boogie turned into a giant monster, becoming one with his manor.
However, he was beaten yet again and disappeared along with the manor. Sora sealed the Keyhole in Halloween Town.
