I didn't know that. Fantastic comment. Thank you. It got me thinking about both how and why Moore was able to make it work with new characters. I think one of the major reasons how/why it worked with new characters is neatly stated on Wikipedia:

> "All but the last issue feature supplemental fictional documents that add to the series' backstory ... Structured as a nonlinear narrative, the story skips through space, time and plot."

http://en.wikipedia.org/wiki/Watchmen