The rebellion on Mars gains traction and threatens the greatest industrial infrastructure in the solar system. For all humanity, Solarians and Terrans join forces in an uneasy alliance. Can they keep it together when a new threat raises its ugly head? Count on Colonel Jenkins and Major Xi Bao to bring their best game with every single shot fired. Rally the troops, blast the metal, and forge ahead. Metal Legion—climb the ramp and come along for the ride. It'll be bumpy and hot, but the sound of the mains is worth it.