The human body is no longer enough. The wars of the future will be fought with mechs. Chief Roach's victory over the ferocious Quatro won't last long, it seems. Strange meteorites have fallen to the surface of Eresos, containing mechs - quadruped mechs, clearly designed for the enemy. The surviving members of Oneiri Team manage to keep the Quatro from claiming the fearsome new weapons, but now they must escort those weapons through the harsh alien wilderness, as fast as they can. If the quad mechs fall into the enemy's possession before Oneiri can transport them to the space elevator, they will lose the advantage granted by their own MIMAS mechs, and humanity will be back to where it was: outmatched and overpowered by the alien beasts.