Vector

The planet Vector? Hello?! How could anyone forget that? That's where the Autobots were all destroyed in a giant battle!

Fiction

Armada cartoon

The Autobots recalled a deadly battle on the planet Vector, one that was orchestrated by the Decepticons' tactician, Thrust. Hot Shot noted the deadly battle as one where all of the Autobots were destroyed. Linkup

The AllSpark Almanac

Vector was an organic, neutral planet located close to Orga, Duke and Moriturus. The AllSpark Almanac II