Episode 3 is the real Pilot of the show--taking place 6 months later after the 2-hour prequel, it introduces the USS Discovery and her crew, and the actual premise of the TV series, which is a bit different than all the other Star Trek shows that came before it.
My main problem is the timeline--setting this TV series 10 years before the Original Series can be a bit of a stretch, since the technology seen and used here seems to be way more advanced than Kirk's era. Ah well, still good though.