Every IDW Transformers comic has led to this cataclysmic story! The culmination of IDW's Transformers Universe! 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.