Sonic X is a 2003 Japanese anime television series based on the Sonic the Hedgehog video game series. The first fifty-two episodes ran consecutively from April 2003 to March 2004 in Japan while the remaining where only available on DVD. In the United States, the first season ran from August 2003 to March 2004, the second ran from September 2004 to March 2005, and the third season ran from September 2005 to May 2006.