Sonic and the Black Knight is a 2009 platform game developed by Sonic Team and published by Sega as part of the Sonic the Hedgehog series for the Nintendo Wii. It is the second and final entry in the Sonic Storybook series, following Sonic and the Secret Rings (2007), and involves Sonic being transported to the story of King Arthur by wizard Merlina, under the pretense that they are attempting to stop a corrupted Arthur ; however, it is later revealed that there was no corruption and that Merlina had secretly wanted to become the Dark Queen to prevent the legend's fate from occurring. Gameplay involves controlling Sonic around with the Wii Remote's motion-sensing functionality, particularly swinging around the sword to attack enemies and to move forward.

Sonic the Hedgehog is a video game series and media franchise created by the Japanese developers Yuji Naka, Naoto Ohshima, and Hirokazu Yasuhara for Sega. The franchise follows Sonic, an anthropomorphic blue hedgehog who battles the evil Doctor Eggman, a mad scientist. The main Sonic the Hedgehog games are platformers mostly developed by Sonic Team; other games, developed by various studios, include spin-offs in the racing, fighting, party and sports genres. The franchise also incorporates printed media, animations, feature films, and merchandise.