Ozzy Osbourne will make a guest apeparance on the popular animated Nickelodeon children’s series Bubble Guppies. Rolling Stone reports that the heavy metal icon, who was once known by the not-so-kid-friendly nickname The Prince of Darkness, will provide the voice of Sid Fishy, a “rock and roll fish who loves being rotten.” Osbourne told the magazine that he was drawn to role because he’s “always smelled a bit fishy,” and because his granddaughter Pearl is a fan of the show.