What started out as a routine search mission has spiraled into something Team Prime couldn't have ever expected when Arcee and Bumblebee stumble upon a battlefield filled with dead Decepticons and shattered human bodies and vehicles. Now they must unravel the truth. Who were these humans? What led to such a devastating battle? Who or what is leaving Decepticon and MECH positions decimated? And what connection do all of these questions have to do with a mysterious group of humans and vehicles that keep appearing at the edge of every few battles the team conducts?