Medea

Medea (メディア Media?) Also one of Mars' High Martians. Medea is also referred to as the Imperial Sorceress (聖なる魔女 Seinaru Majo?) by Mars.

Overview
He first appears in episode 11, appearing to Mars after he finishes his converzación with Leo Mycenae . She mispronounces words, merely to smile slightly, as he is silent for a moment, watching her, and then leave the scene together. Is also presented when Mars gives orders to fight and hunt the Bronze Saints ( Pegasus Kōga and company) that have been saved renegade and Aria. She was seen again in episode 13, while glimpses into his crystal ball to the last vestige of cosmo Seiya has gone. Mars refers to it as "the Imperial Sorceress".

In episode 20 we discover that it is she who is responsible for monitoring to Athena this dam in a tree on the planet Mars.