What would happen if Casey Jones gets mutated by the Kraang? This fic is heavily inspired by the comic 'Opossum Casey' by probably-not-a-rutabaga on Tumblr (tiny_potato02 on TikTok). I asked permission to use their story and they said that I could. In the first chapter, there will be a link to their account and their comic/art. All art and story plots go to probably-not-a-rutabaga and the characters belong to their rightful owners. While the story will contain bits of the comics, it will ultimately have quite a few differences, as I will be adding my own spin on the story.