Rubeus is a member of the Black Moon Clan, and is the commander and chief of the four Spectre Sisters.
Same appearance as the manga.
Rubeus first appears in Rei's mystic fire while she was meditating. He physically appears in the fifteenth episode to find Chibiusa and succeeds in abducting Sailor Mars and taking her to his master on planet Nemesis. He then appears again, this time succeeds in abducting Sailor Mercury as well in his own UFO; the same with Sailor Jupiter. He intended to reveal Wiseman for who and he really is one day but soon realizes that there is more to Wiseman than what he sees. Rubeus went against Wiseman, than attempted to escape from Wiseman then was destroyed by him.