Most Versions in History?
I believe that "Christmas Carol/Scrooge" has been made into more films and TV productions of any story in history; even more than Shakespeare or any other. In total, how many productions are out there?
sharesimply search the IMDB for "scrooge" and, under the character "ebenezer scrooge" it will bring up all the different performances of the character from the beginning of cinema to the present.
there are other stories that have been told many more times than "a christmas carol". being a bit of a horrorphile, "frankenstein", "dracula", and possibly "jekyll & hyde" come to mind as having been filmed more times, and i am sure many of the other great works of literature also give it a run for its money.