The Sonic Riders series is a video game series created by Sega, based on the Sonic the Hedgehog character. The games are set in a world where the evil Dr. Eggman has created a new type of Eggman Empire, and Sonic is the only one who can stop him. The games typically feature threequel-style sequels to the original Sonic the Hedgehog game, with new characters and settings. The series has been released in various countries, including the United States. The latest game in the series, Sonic Riders: Zero Gravity, was released in Japan on July 25, 2017.