One of the first robots brought to life on Earth by the power of the AllSpark, GRIMLOCK is the leader of the DINOBOTS. Though he originally fell prey to the manipulation of MEGATRON, he now understands that Earth and the AUTOBOTS deserve his friendship and protection. There's nothing he enjoys more than melting DECEPTICONS into scrap with his flame breath. Spring into action with this quick conversion beast-to-robot warrior! With just the press of a button, this AUTOBOT ally changes from Tyrannosaurus Rex mode to robot mode - and back again!