Possibly related source concepts:
The excellent HBO series, Carnivale
, was what I thought about when I saw this episode. This isn't to suggest that it will have much in common with that except the fact that a traveling carnival peopled by at least some individuals with more than normal human capabilities lies at the heart of both, but it does make one wonder if Tim Kring didn't get the initial notion from the HBO series, even if he made it his own from that point on. The presence of Robert Knepper in a key role in both strengthens this impression.
Edgar's abilities seem different than, but strongly reminiscent of, the George R.R. Martin shared universe Wild Cards
character Mackie Messer
. Those of you who enjoy reading as well as TV shows like Heroes may well enjoy this book series, which involves a world where people attain superhuman abilities thanks to an alien biological "weapon" which is released on earth. Much like in Heroes, they get these powers somewhat randomly. I consider this book series a possible/likely source of inspiration for Tim Kring. He's been original with it, but it does seem to have a similar "feel" somehow.