Some of the most famous denizens of the sewers are the Teenage Mutant Ninja Turtles, or Hero Turtles as they were originally known in the UK due to laws regarding Ninjitsu and it’s weapons. The Turtles were created in 1984 but it was not until the late1980’s and early 90’s that they really entered into their heyday of popularity. They were created when an experimental goo was accidentally poured over 4 small turtles by a mad scientist. His pet rat, Splinter, was also exposed and he took the 4 turtles down into the sewer where he taught them the skills of the Ninja.
Living in the sewers seemed to agree with the 5 heroes but you can guess that they will have needed the assistance of some decent protection and a Drain Lining Company like https://www.wilkinson-env.co.uk/sewer-repairs-drain-lining-concrete-cutting/ should be high on the list for people to call. Slowly they learned to hone their skill and were named after Italian renaissance painters Leonardo, Michelangelo, Raphael and Donatello.
The Turtles are sworn to fight against the rise of the Foot Clan and their evil leader Shredder, the killer of Splinters owner Hamato. Along the way they also incur the wrath of Krang, an alien warlord and his personal guard, the extremely strong, but not overly intelligent Bebop and Rocksteady.