Deep underground, the Minimoys are waiting... for a champion. Arthur's grandfather disappeared four years ago. All he left behind are his notebooks full of stories about little -- known African tribes--including the Minimoys, a miniature people who are all less than one inch tall. But the Minimoys can't possibly be real... can they?

Arthur is about to find out, as he uncovers a hidden message that catapults him on an adventure wilder than he had ever imagined. In just three days, he must find a way to the land of the Minimoys, recover a stolen treasure, battle an invading force of mosquito -- riding warriors, defeat an evil wizard, win the heart of a very independent princess (Madonna)--and somehow get back home again.

It seems like an impossible task, but as he'll discover along the way, sometimes the littlest heroes can make the biggest difference.

The film is adapted from a series of children's books written by Luc Besson.