Ultra Magnus and his team of AutoBots are on the run from the U.S. Government. They take new Vehicle Modes and Color Skins to hide better. They then come across a small town in California where the Earth Corps company and a group of tourists are trapped below in one of their working mining caves. The AutoBots decide to go and save them with some staying behind. They find the workers and tourists, but also finds mutant monster giants that call themselves Inhumanoids. Creatures that ruled the Earth before Humanity forced underground, and now want to rule the Earth again. The AutoBots also find a Cybertronian called JetFire, who crashed on Earth centuries ago. He was a Decepticon, but now chooses to be an AutoBot. He crashed on Earth because he found a Prime Artifact called the Phase Shifter, belonging to Akiba Prime. They use this weapon to fight against the Inhumanoids, they battle and trap them in the magma of a dormant volcano hidden in the cave.
