DC Challenge is my favorite comic-book series of all time. The premise of the story was that 12 writer/artist teams did a round robin, where a new team took over for each issue and had to resolve the cliffhanger from the previous issue. Thanks to the editorial hand of Robert Greenberger, the story managed to end up with an almost perfectly satisfying resolution after a year's worth of incredibly bizarre story lines. This series was my first introduction to some of the more obscure characters of the DC universe, such as Dr. Thirteen and Space Cabby.
Somewhere in storage I have my original set, and over the years I bought two more sets, just in case.
They are also in storage.
But recently, I found myself wanting to re-read the series yet again.
Fortunately, full sets are not hard to find these days, thanks to the Internet and eBay...