The Eliminators are a group of sentient robots created by The Darkness to help it in its plans. Like the head Eliminator, the Destructinator, they are powered by nuclear energy and are parodies of the Terminators.
When the Darkness appeared on the superhero planet of Wonder World, the citizens were frightened by its appearance and attacked it with the planet's main weapon, the "Thunder Rockets".
But instead of harming it The Darkness absorbed the rockets and recycled them into the Eliminators who, from then on, would act as The Darkness' guardians and servants.
They are also able to create some sort of portal to disguise themselves as other people or objects, thanks to the fake-i-fiers stolen from the Yugopotamians, but later, they are able to use disguises without the fake-i-fier.
Their dialog mostly consists of saying "Eliminate Timmy Turner!".