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Teenage Mutant Ninja Turtles is an American media franchise created by the comic book artists Kevin Eastman and Peter Laird. It follows Leonardo, Michelangelo, Donatello and Raphael, four anthropomorphic turtle brothers (named after Italian Renaissance artists) trained in ninjutsu who fight evil in New York City. Supporting characters include the turtles' rat sensei Splinter, their human friends April O'Neil and Casey Jones, and enemies such as Baxter Stockman, Krang, and their archenemy, the Shredder.

The franchise began as a comic book, Teenage Mutant Ninja Turtles, which Eastman and Laird conceived as a parody of elements popular in superhero comics at the time. The first issue was published in 1984 by Eastman and Laird's company Mirage Studios and was a surprise success. In 1987, Eastman and Laird licensed the characters to Playmates Toys, which developed a line of Turtles action figures. About US$1.1 billion of Turtles toys were sold between 1988 and 1992, making them the third-bestselling toy figures ever at the time.

The action figures were promoted with an animated series, which premiered in 1987 and ran for almost a decade. In some European regions, the word "ninja" in the name was replaced with "hero" for its violent connotations. Three live-action films were released; the first became the highest-grossing independent film up to that point. In 2009, the franchise was purchased by Viacom, now Paramount Global. Viacom commissioned a new comic series, two new live-action films, and new animated series.

The comic book authors Kevin Eastman and Peter Laird met in Massachusetts and began working on illustrations together. In 1983, Laird invited Eastman to move in with him in Dover, New Hampshire. That November, Eastman drew a masked turtle standing on its hind legs armed with nunchucks. Laird added the words "teenage mutant".

Metalhead has not been a contender in any CBUB matches.