Arthur sets out to save his family's home from real estate developers when his grandfather mysteriously disappears. When he finds his grandfather's ancient clues of treasure, he unlocks a passageway that leads to a spectacular world with little people.

Huey, Dewey, Louie and Webbigail Vanderquack accompany their wealthy uncle Scrooge McDuck on a trip to Egypt in search of the long-lost riches of Collie Baba's ancient pyramid. After an epic battle with Merlock the evil sorcerer over a magic lamp, Scrooge and his companions discover that friendship and family are far more valuable than even the most fantastic fortune.