Generator Rex is a nanotechnology-themed science fiction action animated series from the United States, crafted by Man of Action for Cartoon Network. John Fang from Cartoon Network Studios takes on the role of supervising director. The show draws its inspiration from the 1999 Image Comics publication, M. Rex. It made its debut on Cartoon Network in the U.S. on April 23, 2010, and carries a TV-PG rating. The series concluded its third season with the final episode airing on January 3, 2013.