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...