On the planet Cybertron, there’s this guy named Primus who gave himself up so all Transformers—those shape-shifting robot aliens—could use Energon to grow and develop. Everything was going fine until a war broke out with the Quintessons, who wiped out most of the elite warriors known as the Primes. Sentinel Prime is the only one who makes it through and helps his people hide underground to survive. Since they lost something called the Matrix of Leadership, Energon stopped flowing like it used to. Now, miners—robots that can’t even transform—have to dig up whatever energy is left under the ground...
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