The Teenage Mutant Ninja Turtles (often shortened to TMNT or Ninja Turtles) are four fictional teenage anthropomorphic turtles named after Italian artists of the Renaissance. They were trained by their anthropomorphic rat sensei in the art of ninjitsu. From their home in the sewers of New York City, they battle petty criminals, evil overlords, mutated creatures, and alien invaders while attempting to remain hidden from society. They were created by Kevin Eastman and Peter Laird.
The characters originated in comic books published by Mirage Studios and expanded into cartoon series, films, video games, toys, and other merchandise. During the peak of the franchise's popularity in the late 1980s and early 1990s, it gained worldwide success and fame. (from Wikipedia)