This is during scooby Doo and the reluctant werewolf. I've only watched parts of that movie. Story: shaggy was fully human until dracula's curse went wrong. Now a human werewolf hybrid, he is comforted by danny Fenton, a human ghost hybrid. Title stands for scooby Doo and the reluctant werewolf.

Muzan Kibutsuji turned Danny Fenton into a demon

He is an anodite