After the major breakout success of
Sailor Moon, a renewal for a second season (or "series", if you will) was inevitable. The result is
Sailor Moon R.
Because of issues with the manga not quite being up to speed, the series starts with what the show does best: filler! The Makaiju Arc is a thirteen episode long anime exclusive and outside of serving as a gradual reintroduction to the concept and a way to drop some necessary power-ups, is almost without content. It has almost no bearing on the greater plot as a whole and can be safely skipped with a short summary.
Ail and An are two aliens that have been wandering through the depths of space on their giant tree. After taking residence in Tokyo and adopting some pretty poor disguises (but still better than the heroes), they start sending monsters out to gather energy while trying to blend in with the natives.
Now, if this seems unusually weak compared to the Dark Kingdom that once obliterated a whole planetary civilization, that's because it is. Still, the show tries to make a point that this is somehow a much more overwhelming threat and inspires the heroes to new levels of power. Everyone gets a new attack, Usagi gets a new transformation brooch with new stock footage and a new attack, and the team is stronger as a result.
Even in spite of (or, perhaps, because of) their total lack of believable threat, Ail and An are actually pretty sympathetic. Sure, they don't start out as very nice people, but unlike the perpetual stasis of Usagi's bad behaviors being glossed over with informed statements, they actually seem to grow from the experience. It's weird, I know, but the hollow filler arc with no greater implication on the story is the only one out of the first three seasons to have all that much depth. It's a shame they suffer from the same bi-polar syndrome that seems to affect all the characters, but it's not quite as suspension of disbelief breaking. One wonders how the rest of the show would have been if they just created new content instead of (loosely) following the manga.
Most of the mentioned problems in other reviews remain. The heroes don't evolve outside of their new powers and the show still uses a rigid, formulaic structure. The status quo is maintained for the next season to minimize changes between the two versions.