Sol. Humanity's birthplace. And the enemy of the humans known as Terrans.
The Metal Legion is committed to saving all, despite their differences, despite their loyalties. Leeroy Jenkins commits the Metalheads to a battle that makes them traitors to the Republic and enemies of the Solarians. It's the no-win scenario.
Unless they can do the unthinkable. The stakes are high and risk higher as they bet everything they have in a single pitched battle to win the freedom of all humanity.