A kid lost his father at a very young age. Said father was working on a very important yet conveniently vague project at the time. A gruff military commando type with a colorful crew of purely comic relief characters shows up a decade later to recruit said kid in a mission to continue the father's work. After some pretty explosions and whatnot, the military commando guy's secret agenda is revealed, he betrays the main character, then he is betrayed by one of his own crew et cetera. Skip to the dogfight on the exterior of a large spherical craft, the good guys win, a whole race gets saved by unlocking some hidden power or another, boy gets girl... sound familiar? It should. Not only is it the entire plot of Atlantis, but it's also part of the plot of Titan A.E., another animated movie that preceeded Atlantis by two years. The big difference was that Titan's plot was a lot more complex and involving, and didn't take a backseat during the action sequences.
The story is fine, the animation is fine, Michael J's performance is great etc. etc., but the one thing that bugs me is the disturbing number of parallels between this movie and Titan. If the plot hadn't been such a total ripoff, then I think this movie would deserve five stars. However, I have to take one off for blatant lack of creativity.