One of the best films signed Blue Sky Studios. Direction not exactly impeccable, but with a lot of interesting ideas, especially in the "noisy" scenes where you usually get confused, instead here everything is crystal clear and all in detail. Excellent mixture of humor and action, also due to the charisma of the Smith-Holland couple. Bad for some important in-depth background not told, especially for the poor characterization of villain, which is merely reduced to the redundant sector of pain-revenge, but nothing not passable. A beautiful small pearl in animated films.