This is it - the Autobots have a new leader! Within these very pages you'll witness Transformers history in the making, as another Autobot assumes Optimus Prime's mantle of leadership. Will it be Grimlock who takes over? He certainly wants the job, but is he really the stuff Autobot leaders are made of? One things for sure, Grimlock's going to have to fight for the Autobot leadership every inch of the way, thanks to the newest (not to mention biggest and deadliest) Decepticon to arrive on the scene. Trypticon is here - and he's out to make sure there are no Autobots left for anyone to take command of. The Ark is under attack like never before, and only the Dinobots can save it!