Career mode entails that the player completes primary objectives to continue/pass the level that usually consists of protecting an alley, finishing a race first, or by killing a selected target.

After the leader is defeated and the safeguard shut down, SAGE's database is reactivated and through her learning history, deduces by machine theory that the only way to protect humanity from themselves is through their destruction.

The player is forced to fight her, whose database is in another "S" class vehicle named Executioner, and her personal army and chases her to her lair, a deserted military base where she prepares to have Meridian City destroyed.

In the PSP version, SAGE has been created as a supercomputer to aid the world, rather than just one city, against natural disasters that had already claimed millions of lives during the past two decades leading up to the present.

As the supercomputer had easily come up with solutions faster than humanity could or was unable to solve, their dependence on SAGE greatly increased, ultimately serving her as a result.

In response, vehicular-combat tournaments are held by the Master/Slave Organization (MSO), a group of scientists turned revolutionary wannabes whose aim is to ensure the end of SAGE's influence.