Sonic X is an anime series based on the Sonic the Hedgehog video game series. It originally ran consecutively on Sundays from April 6, 2003 to March 28, 2004 with a total of 52 episodes (collectively known as the Japanese "Series 1"). In Japan, episodes 53–78 ("Series 2") initially went unaired on television, becoming direct-to-video releases. Episodes 53–78 were first broadcast on TV in France and parts of Asia before they aired on UK/US television.
As part of Kids Station's 2020 line-up of programming, it was announced that, as part of a tie-in promotion for the Sonic the Hedgehog film, the network would finally begin broadcasting the remaining episodes in 2020. This would mark the first time that the episodes would air in any format on Japanese television.
For the English dub produced by 4Kids (which aired on Fox's Saturday morning block FoxBox, later renamed 4Kids TV from August 23, 2003 to May 6, 2006), episodes 1–52 were referred to as Seasons 1–2, each 26 episodes long, and episodes 53–78 were referred to as Season 3, but the Saga Set DVD releases split the episodes into 6 seasons, each containing 13 episodes. The airdates for TV Tokyo are listed on the left, while the airdates for the 4Kids English dub are on the right. For Season 3, air dates for the Japanese run reflect the first date of Kids Station's broadcasts.