In order to find his grandfather's lost treasure and save the Minimoys, Arthur and his companions, including Princess Selinia, travel into the forbidden city ruled by Maltazard the Cursed.
Arthur's quest takes him into the heart of the forbidden city ... Arthur's backyard looks like a peaceful, ordinary garden -- if you are human-sized, that is. But if you're half an inch tall, like the Minimoys, this backyard is a vast world where fierce battles are fought, ferocious monsters are faced, and one evil wizard, Maltazard the Cursed, rules with cruel power from his terrifying stronghold: Necropolis, the forbidden city. Now ten-year-old Arthur -- magically transformed into a Minimoy -- and his Minimoy companions, brave Princess Selenia and mischievous Prince Betameche, must somehow find a way into this forbidden city. Their mission: to rescue Arthur's grandfather, recover a stolen treasure, and save the land of the Minimoys once and for all, before it's too late. But once you're inside the forbidden city .... can you ever get out again?