Teenage Mutant Ninja Turtles is an American

United States

The United States of America is a federal constitutional republic comprising fifty states and a federal district...

 animated series, mainly set in New York City

New York City

New York is the most populous city in the United States and the center of the New York Metropolitan Area, one of the most populous metropolitan areas in the world. New York exerts a significant impact upon global commerce, finance, media, art, fashion, research, technology, education, and...

. It first aired on February 8, 2003 and ended on November 21, 2009. The series marked the revival of the franchise as a Saturday morning cartoon

Saturday morning cartoon

A Saturday morning cartoon is the colloquial term for the animated television programming that has typically been scheduled on Saturday mornings on the major American television networks from the 1960s to the present; the genre's peak in popularity mostly ended in the 1990s while the popularity of...

 on Fox's

Fox Broadcasting Company

Fox Broadcasting Company, commonly referred to as Fox Network or simply Fox , is an American commercial broadcasting television network owned by Fox Entertainment Group, part of Rupert Murdoch's News Corporation. Launched on October 9, 1986, Fox was the highest-rated broadcast network in the...

 Fox Box programming block (later known as 4Kids TV

4Kids TV

4Kids TV was a Saturday morning television programming block on the Fox Broadcasting Company. The block was part of the Fox Network schedule...

) The TMNT 2003 TV series was produced by 4Kids Entertainment

4Kids Entertainment

4Kids Entertainment is an American film and television production company in bankruptcy since April 2011. It is known for English-dubbing Japanese anime and specializing in the acquisition, production and licensing of children's entertainment around the United States...

, and Mirage Studios

Mirage Studios

Mirage Studios is an independent American comic book company founded in 1983 by Kevin Eastman and Peter Laird, based in Northampton, Massachusetts and best known for the Teenage Mutant Ninja Turtles comic book series.-History:...

, which each owned half of the rights to the show, and animated by Dong Woo Animation

Dong Woo Animation

Dongwoo Animation Co. Ltd is an animation studio located in Seoul, South Korea. It has produced many animated series and films created and produced in the United States, Canada, South Korea and Japan...

.