"In this war of life, depletion is the sole constant."

Standing upright, Exhaust is easily seen as an oddity in nature. Mysteriously able to utilize his displaced body parts, little is known about his actual genetic makeup. In Episode 4, he is found on a rare alien-like battleground which merely hints toward his true origins. Master Casey deduced however that he feeds on the neurotransmitters that regulate wakefulness in humans in order to sustain vitality. Taking in certain elements of his form has led Master Casey to liken him to a mixture of the mechanical and the organic.  

Human life is once again in danger of being choked off through Exhaust’s method of survival however his end goal yet remains unclear. During Joe’s visit to Korea, Gelo and friends first encounter this intimidating creature. Dangerous and deadly, Exhaust is a foe that must be taken down immediately in order to avoid the very thing that builds him up- the loss of energy.