The end is nigh! Unicron, a planet-sized being that devours other worlds, has set its sights on Cybertron and all of its colonies–including Earth! Optimus Prime, Bumblebee, and their friends must unite every Cybertronian, Earthling, and ally they have to stand against this threat to all existence. But why is Unicron hell-bent on destroying Cybertron–what original sin did Optimus Prime's ancestors commit to earn this wrath? It's an all-out battle against extinction as the world-destroying, universe-shattering threat of Unicron is on its way.