Zoid

the long version

A spaceship the size of a city drifts through space on its century-long journey to find a new Earth. When it launched it was populated by thousands of hopeful passengers and the most technologically advanced Zoids in the world, ready to serve the crew's every need. But that was then, and this is now. The Zoids rebelled against their masters, wiping out most of the crew in one bloody uprising. Now the few remaining humans are hunted by the Zoids like vermin. Fourteen-year-old York is a Scavenger - he hunts Zoids and kills them by any means he can, bringing back their parts to mend the technology on which the few remaining humans rely.