The only high point in this movie is the cute kick-tail alien girl and the white-haired hacker; their characters were at least entertaining.
The rest: bad script (seriously boring... and I don't bore easily), clumsy animation not even worthy of Saturday morning kid's shows, and a bulky, slow-moving plot that had me yawning less than halfway through the movie. I'm surprised I managed to stay awake through this cliche-ridden snooze fest.
Large chunks of the movie consists of scenes such as mind-controlled teachers wandering through the halls, and wandering, and wandering. Students hiding in classrooms. And hiding some more. Maniacal laughter from the bad guy. Yawwwwwn.
Little kids might enjoy this... or they may be bored as well. Even the action scenes in this are dull. I don't require adrenaline in my films and I love a good slow-burner, but it is just poorly done on every level.