Demons and angels are responsible for keeping the world balanced. Some of them are defective, however.
Angels are responsible for taking care of some humans who are compatible with them. Some of the defective demons are sent to Earth with this same purpose.
Oliver is a defective demon that caused a lot of problem in the Control Plane. However, Oliver is the only one compatible with the human Maxwell, so he is sent to take care of him and learn about the planet.
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