Three Guardians
Sailor Uranus, Neptune and Pluto appear before Sailor Moon and the other Guardians to reveal their true agenda. Learning what’s at stake, Sailor Moon and the others offer their help but are rejected by Uranus, causing further tensions...
Aired 16/05/2016EP 7 - Three Guardians

2016
Pretty Guardian Sailor Moon Crystal: Season 3
The new season will assemble all 10 Senshi — specifically, the popular outer Senshi such as Sailor Uranus, Sailor Neptune, and Sailor Saturn will join Sailor Moon, Sailor Chibi Moon, and the others. The new season will adapt the arc from the fifth and sixth volumes of the complete edition of Naoko Takeuchi's original Sailor Moon manga.
Note: VIZ Media has labeled the 3rd cour as "Season 3", while they have labeled the 1st and 2nd cour of the first season as "Seasons 1-2".