IGPX: Immortal Grand Prix refers to two anime series co-produced simultaneously by Cartoon Network and Production I.G. The first is a "microseries" consisting of five 5-minute episodes, and the second is a 26-episode animated series loosely related to the first. Koichi Mashimo co-wrote and directed the microseries, while Bee Train Animation and Production I.G animated it, and Bandai Entertainment acted as the North American distributor. The full-length anime series was handled by director and writer Mitsuru Hongo and was animated by Production I.G, with Bee Train returning for in-between animation. Production I.G president Mitsuhisa Ishikawa joined on as producer for the series. It was the first time he had worked on a joint U.S. Japanese production, due to the Pokémon companion franchise. The series' production was managed by Williams Street in Atlanta, Georgia. Bang Zoom! Entertainment in Burbank, California produced the English dub for the series, as well as adapted the scripts alongside Williams Street. IGPX was commended for being the first original series on Toonami. An IGPX video game was released on September 12, 2006, for the PlayStation 2.

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