is a Japanese anime television series created by TMS Entertainment and based on the Sonic the Hedgehog video game series published by Sega. Sonic X initially ran for fifty-two episodes, which were broadcast on TV Tokyo from April 6, 2003, to March 28, 2004; a further twenty-six were aired in non-Japanese regions such as the United States, Europe, and the Middle East from 2005 to 2006. The show's American localization and broadcasting were handled by 4Kids Entertainment—which heavily edited the content and created new music—until 2012, when Saban Brands obtained the rights to the series, and later in 2015 by Discotek Media. It is the fourth cartoon of Sonic the Hedgehog following Sonic Underground and preceding Sonic Boom.