When the Golden Tribe sent out their call, the first 3 tribes to answer were the Silver Tribe, the Bronze Tribe, and the Heroic Tribe. The last one to answer was the Iron Tribe. Soon after, the Golden Tribe left, the Silver Tribe claimed themselves as the new "guardians of space" and they attacked Earth, the home planet of the Iron Tribe.
The War Edit
The Silver Tribe attacked the home planet of the Iron Tribe by controlling the Bronze Tribe.