The IDW Generation 1 storyline in updated chronological order, bringing you the entire span of this masterful reinvention of the classic characters and scenarios. Secrets and lies abound as Onyx Prime - one of the original 13 Primes - unveils his true face, in the process exploding just about every Cybertronian myth and legend and unraveling everything we thought we knew about the entire TF/IDW-verse! Trust us, it's an eye-opener! But, as shocking as Onyx's revelations are, really that's just the tip of the iceberg that's on a collision course with Cybertron, an ancient force closing in with Armageddon in mind. Yes, after 'The Falling' comes 'Unicron', and it all begins (and in due course ends) right here. Features material created especially for the Definitive G1 Collection, including a new contextual introduction by series editorial consultant Simon Furman COLLECTING TRANSFORMERS: OPTIMUS PRIME #18-24