Queen Metalia first appeared during the invasion at the Moon Kingdom as a giant shadowy entity with yellow glowing eyes and a blue mouth.
In the anime, Queen Metalia is much the same, with a few exceptions. Originally, Queen Beryl collected human energy to try and free her before then seeking the Silver Crystal. Additionally, she does not possess Prince Endymion, but fills him with her dark energy, eventually making it impossible to heal him with even the Silver Crystal. She eventually becomes powerful enough to resurrect herself, taking possession of a dying Queen Beryl, transforming her into a towering goddess-like creature referred to as Super Beryl. Both she and Beryl are destroyed by Princess Serenity and the Silver Crystal.
- Queen Metalia is the only "greater antagonist" destroyed at the same time as the main antagonist (as they were combined together at the time). Most of the other ones kill the true main antagonist, except the case of Pharaoh 90 and Professor Tomoe, as Tomoe survives (though the one possessing him is killed).
- In the manga, she looked like a humanoid shadowy figure, but in the anime, she looked like a black cloud.
- In the DiC English dub, she was called The Negaforce and in that dub, she had no gender. In the Viz Media English dub, she is called "Queen Metalia".