A fictional cartoon series (and also few cinematic movies) about 4 teenage mutant ninjas who live in the sewers of New York City. The main characters are Leonardo, Michelangelo, Donatello and Raphael. They are trained by their sensei - Splinter, a rat mutant who knows everything about ninjutsu. Most series contain their human friend April O'Neil who's a reporter on TV. There's always an evil that teenagers fight against and the main character of evil forces is The Shredder who's also a ninjutsu master. These cartoons were really popular during 90's.