invisibility because I had re-watched a Smallville episode with an invisible character, then forgot that that was why I had asked the question. A series like Smallville or Star Trek can systematically address each sf theme in turn. Ray Bradbury addressed several such concepts in his episodic The Martian Chronicles. The X-Files went further because any particular episode could be sf, fantasy or a mainstream thriller.
A writer of sf short stories can recycle a wide range of unoriginal concepts provided that he invents an original approach to each. So here is an Andersonian exercise:
list every fsf concept from AI to zombies;
beside each concept, write the name of a non-series Poul Anderson short story addressing this concept;
then add other Anderson stories addressing the same themes in different ways;
then add series and novels;
thus, identify any concepts that Anderson does not address.
But I am not going to do it.