Dear Steve, In the current Mark Twain Annual, Derek Royal has a terrific piece on all the comic book treatments of Twain, as well as some of the odder graphic representations of his work out there in cyberspace. They are not all "spinoffs" but they're really interesting appropriations and interpretations of his work. Hope that helps! Ann Ann M. Ryan The Mark Twain Annual, Editor Associate Professor Department of English Le Moyne College Syracuse NY 13214