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This article is about the Youma owned by Nephrite. For the star Castor, see Castor (star).

Character Information
Name: Castor
Name (kanji/kana): カストル
Alignment: Dark Kingdom
Species: Youma
Gender: Female
Lives: D Point, near the North Pole
Occupation: Youma under the command of Nephrite
Family: Pollux (twin)
Associates: Nephrite
Aliases: None
First Anime Appearance: Protect the Children's Dreams! Friendship Linked by Anime
First Manga Appearance: N/A
First PGSM Appearance: N/A
English Name: Gemini Warrior (DiC dub), Castor (Viz dub)
Actors: Akiko Hiramatsu (anime), Alison Sealy-Smith (dub)

Castor was one of the strongest Youma owned by Nephrite. She and her twin, Pollux, were implanted into a pencil owned by Hiromi Matsuno.

Castor could imitate Fire Soul, and used that to attack. She often argued with her twin, however, which would cause the two of them to get distracted from the fight. Sailor Moon, Sailor Mercury, and Sailor Mars finished off the twins with Moon Tiara Action, Sabão Spray, and Fire Soul, and the energy they stole was returned to Hiromi.

Video Games[edit]

Castor was one of the monster types that appeared in the video game Sailor Moon: Another Story. Numerous Castors could be fought during Chapter Four, in the ruins of the Silver Millennium.

Castor was a monster in the Sega Mega Drive game Bishoujo Senshi Sailor Moon.

Castor and Pollux were also level bosses in the arcade game Pretty Soldier Sailor Moon. The two could pair up and produce a static field that would electrocute anyone who was touching them, including other monsters. When using this technique, they assumed a pose similar to that which they assumed when they first appeared in the anime.


  • She and her twin, Pollux, were named for the mythological Gemini.