Sailor Pluto, also known as Setsuna Meio, is the first-appearing member of the Outer Sailor Scouts. She is the guardian of time and space, and is Chibiusa's protector (she communicates with her through her Luna-P, and frequently refers to her as "Small Lady"). In the third season, she teams up with Sailor Uranus and Sailor Neptune to help the inner-scouts fight Mistress 9. Sailor Pluto's attack name is "Pluto Deadly Scream". In addition, she is the oldest and most mature of the Sailor Scouts.
Sailor Pluto appeared in person was originally voiced by Sabrina Grdevich for the R season, as well as the S and SuperS movies. For the regular S season (dubbed a while later), Sabrina was unavailable, and Susan Aceron was cast as her replacement.