Sewerman General Johnson is "The Boss"![1]

Sewerman General Johnson is in charge of the sewers in an indeterminate area: perhaps throughout the U.K., or England, or Yorkshire, or at least Tackleford. He was introduced during the Case of the Severed Alliance, where he showed Sonny and Linton the Tackleford Fatberg beneath the Chamber of Commerce. However, it's possible he was the boss of Lottie's mum's boyfriend Colin in the Case of the Unwelcome Visitor, whose job involved dealing with sewer emergencies.