"Infinite Labyrinth" 1
With Chibiusa on the verge of death, and Hotaru being completely taken over by the enemy, Sailor Uranus, Sailor Neptune and Sailor Pluto part from the group to annihilate Mistress 9 once and for all, even it means destroying both Hotaru and the spirit of Sailor Saturn in the process.
Aired 30/05/2016EP 9 - "Infinite Labyrinth" 1
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".