|This character exists primarily or exclusively within the Sonic the Comic continuity.|
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.
Serpentus is one of many obstacles people hoping to steal the Ultragem must face, and when Xenor Krell stumbled across it, Serpentus nearly ate him alive. However, luckily for Xenor Krell, Amy Rose and Tekno arrived via the Eternity Ring at the precise moment. Although Serpentus' thick hide protected it from Amy's crossbow it fled from them. Serpentus returned but to late, Amy Rose had already given the Ultragem to Xenor who used it to transform the Ultragem into mist.