Aero-Troopers: The Nemeclous Crusade (2003)

In a world beyond imagination where fantastic tree villages float in midair, a young boy named Joshua dreams of adventure. Forced from his home by an evil mechanical beast called Nemeclous, he discovers a fantastic world high above the clouds. There he must join an elite force the Aero-troopers who are sworn to protect the skies. Joshua now finds himself on the kind of adventure he has always dreamed about...but little does he know the entire fate of the skies lies in his hands.