土萌螢
is a fictional character in the "Sailor Moon" manga series created by Naoko Takeuchi. She is the alternate identity of , a young Japanese schoolgirl and a member of the Sailor Guardians, supernatural female fighters who protect the Solar System from evil. Sailor Saturn is the tenth and last of the Sailor Guardians to be discovered, possessing powers associated with silence and ruin, nothingness, destruction, death, and rebirth that made her a potential threat as she can wipe out a planet and even an entire galaxy or reset its evolution.