Could someone please help me understand the potential availability of all the episodes. I have read that about half (over 200) of the episodes were put into syndication. I also keep reading here that some episodes are in the public comain (PD). Are those PD episodes a subset of the syndicated shows? Are there some epsodes that were not part of the syndication that are floating around available in the public domain? Is it possible therefore (with much effort I would assume) to be able to see every one of the 435 episodes or are there some that are just missing in action - televised once and never shown again, hidden away in some starge vault or just lost?