It's basically just the pilot--was aired as a stand-alone two part miniseries before they ordered a full season of the show.

It's something like 3-4 hours long and they should group it with season one on Netflix since they sell it as part of the season one DVD set. The first regular episode after the miniseries is called "33." If season one starts with that, poke around Netflix for the miniseries as a stand-alone. The show won't make much sense without it, but it can be a big slow.