Robots, once used as laborers in mines and for other dangerous tasks on the Sentai Mountain, rebelled against the humans. They originally fought the humans using Mining Machines and tools, such as pickaxes. During the rebellion, so much energy was created that it split the mountain in half. The robot rebellion was overcome and they were pushed into The Gorge. At the bottom of the mountain they rebuilt themselves and converted the mining machines into Battle Machines. They attacked the humans inhabiting the mountain, quickly taking over one half. They built huge factories all over their side of the mountain, using captured humans as labor slaves. They have been contesting the humans' dominance over it ever since. There are four types of robots.

Using Sentai Fortress as their main base, Exo-Force now keeps the robots at bay, using their own Battle Machines.




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