Really this is She-Ra season 2 part 2 but it is billed as season 3 on Netflix. The streaming service appears to be encouraging shows to run shorter seasons more frequently. That makes sense as a way of both encouraging binge watching and helping draw in viewers with new seasons appearing.
For She-Ra that meant that season 2 finished around the point where the major plot arc was just warming up again after a few fun stand alone episodes. That left season 3 as much tighter plot-arc driven set of episodes.
Starting with Shadow Weaver visiting Adora, the episodes amount to a series of revelations about Adora, the First Ones, Hordak and the ‘first’ She-Ra Mara. We learn less about Catra’s backstory but her arc from friend to rival to arch-enemy continues to be both sympathetic and unforgiving.
Lots of twists, so I can’t really summarise but it is a genuinely great bit of TV.