derivative work

random quotes ... to amuse, inspire, enrage:
  There was another department whose mission in life was to steal. Steal from dead people, it's true, but steal nonetheless. Sparky had long ago given up coming up with plots and, except for the occasional inspiration, characters. Anything in the public domain was fair game. Old comic books were a fertile source. Almost anyone who had had his or her own comic book in the twentieth or twenty-first century had made a guest appearance on Sparky by now. Sparky had visited locations from Gotham City to Surf City. Old movie and television serials had been plundered for plotlines and cliffhangers. Sparky had entered alternative universes, places where classic private eyes, singing cowboys, half-breed aliens with pointy ears, and giant radioactive ants actually existed.