Teenage Mutant Ninja Turtles [or TMNT], is the story about the four turtles who are living in the sewers of New York City and fights the evil powers who tries to get rid of them. The turtles, who first appeared in comic books, can now be found in toys, movies, video games and other merchandises. The turtles peak was between the 80s-90s.
The four turtles names are: Leonardo, Raphael, Michelangelo and Donatello.
Their master is Splinter.
The official site: http://www.ninjaturtles.com/