The Dinobots continued hiding out in the Cascades , stealing fuel from humans and sending Swoop out to spy on the Autobots at the Ark. Learning that Optimus Prime was dead, Grimlock decided to return and seize command for himself. Bursting into the Ark, he denounced Prime's style of leadership as weak and insisted only the strongest should lead but was soundly rebuffed by the assembled Autobots. Meanwhile, Ratbat , the Decepticons' fuel auditor on Cybertron, had sent Trypticon through the space bridge to annihilate the Earthbound Autobots once and for all. Outside the Ark, the Dinobots stood back and watched the slaughter for a while until Trypticon threatened Rachel Becker , a palaeontology student who had taken an interest in the local Transformer activity, which drove Grimlock to defend her. Following their leader's example, the other Dinobots charged, battling Trypticon until his fuel quota for the trip was expended and Ratbat recalled him to Cybertron. For showing courage and compassion in during the battle, the grateful Autobots then elected Grimlock as their new leader. King of the Hill!
Power up for the ultimate robot battles! Your Grimstone Commander vehicle is already a virtually unstoppable opponent in his Commander Triceratops mode and Commander robot modes. But his strength gets increased five-fold when you convert him to Power-Up mode and convert his Dinobots drone figures into his limbs! And the action doesn’t stop there. With this Power Core interchangeable robot combination system, Mini-Cons (sold separately) and drone vehicles can attach to power up any Commander figure. Collect more packs and you can create tons of unique and fierce robot battler figure combinations! Five-pack includes Grimstone, Spinosaurus Drone, Pachycephalosaurus Drone, Ankylosaurus Drone and Parasaurolophus Drone figures. Convert him to Power-Up mode and convert his Dinobots drone figures into his limbs!