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The Exterminator appears in "Along Came a Sister", having been contacted by Lynn Sr. to exterminate Frank. The Loud siblings and Clyde are able to outsmart him, but he corners Frank and sprays him, only for Leni to save the spider. She explains to the Exterminator that if he kills Frank, he will ruin Lincoln's reputation. The Exterminator says that she changed his life, though he made that up and left, leaving them with their bill for his service.
The Exterminator is an overweight man with a large beard, and brown hair tied in a ponytail. He wears a dark blue suit with black gloves and boots. He carries a fumigator, which is attached to a spray gun. He also sports a pair of goggles on his forehead, and a white mask.