For twenty-five years the colossal battle between Megatron and Optimus Prime has captivated Transformers fans around the world. Yet the full story of the conflict between the two most famous Transformers - verything that happened before Optimus and Megatron arrived on planet Earth - has always been a mystery...until now. Here, for the first time told in its entirety, is the thrilling saga of Optimus and Megatron before they were enemies, before they even knew each other. This gripping, action-packed novel reveals all the loyalties and treacheries, trust and betrayals, deadly violence and shining ideals, as well as the pivotal roles played by other characters, including Starscream, Sentinel Prime, Omega Supreme, and one of the thirteen original Primes, the last link to Cybertron's glorious Golden Age. Discover how meek disciple Orion Pax becomes the fearless leader Optimus Prime, follow the tantalizing clues about the lost Matrix of Leadership and the lore surrounding it, find out why the two allies fighting a corrupt regime suddenly turn on each other, and what triggers their epic war. Transformers: Exodus provides everything fans ever wanted to know about one of the fiercest rivalries of all time.