Meet Crank and Al ...robots on the run. Wandering through an enormous junk yard, our heroes find themselves entering a hidden robot world.

They are welcomed by the Mekanix, who choose Crank to be the next race driver.

His job: to beat their rival gang, the Engineerz, in a high-speed race through the sewers of Metrocity.

But there's something sinister about the Mekanix and their tunnel racer ...