|This article is about the Youma owned by Nephrite. For the star Castor, see Castor (star).|
|Lives:||D Point, near the North Pole|
|Occupation:||Youma under the command of Nephrite|
|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 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.
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.