Act 34. Infinity 8: Infinite Labyrinth 1 Bishôjo senshi Sêrâ Mûn Crystal : Season 3 Episode 9

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.