Antagonists

Ridley: The cybernetic space dragon and leader of the Space Pirates, serving as Samus's arch nemesis across nearly every game. Mother Brain: The biomechanical supercomputer that controls the Space Pirates' operations on Planet Zebes. Metroid Prime / Dark Samus: A mutated, highly potent Metroid organism and its corrupted doppelgänger that terrorizes the universe. Raven Beak: The tyrannical leader of the Chozo Mawkin tribe who serves as the ultimate antagonist in Metroid Dread. Kraid: A massive, reptilian kaiju-like monster who guards the depths of Zebes.

Other Characters

Sylux: A mysterious rival bounty hunter armed with advanced, prototype Federation technology. Galactic Federation Hunters: Including characters like Rundas, Ghor, and Gandrayda, who aid Samus before being corrupted in Metroid Prime 3. Phaaze: The sentient, living planet and source of all Phazon corruption in the Prime series. Phazon: Phazon is a highly radioactive, mutagenic substance and superorganism from the Metroid series. It is the central, malevolent force of the Metroid Prime trilogy. It comes in three forms. Blue Phazon, the most common form, characterized by glowing, radioactive blue energy and veins. Red Phazon, a highly volatile and dangerous mutation of normal Phazon, which deals extreme damage. Orange Phazon, an even more potent and radioactive variation that acts as a spawning ground for Fission Metroids.