Sonic is summoned by Merlina to defeat the corrupted Black Knight, later revealed as an illusion created by Merlin, with Merlina herself as the Dark Queen seeking eternal stasis. Sonic prevails using Excalibur and the Knights of the Round Table—Shadow as Lancelot, Knuckles as Gawain, Blaze as Percival, and Amy as Nimue—before the story confirms him as the true king.

The narrative stays fixed on heroism, sword combat, and resisting tyranny through personal resolve. The 2009 development focused exclusively on letting Sonic wield a sword while keeping his established personality intact, with no romance systems, pronoun options, nonbinary characters, or identity-based storylines introduced. Thematic content remains centered on traditional fantasy adventure and individual determination rather than any systemic critiques or redefinitions of norms. This approach produces a clean, unencumbered experience that prioritizes gameplay and character action over contemporary messaging.