Dark Samus is the final boss. And after you defeat her, you have to escape to your ship.
The main villain ( or boss) is Dark samusMain villain is Metroid Prime, which later forms Dark Samus after absorbing Samus' Phazon Suit.
Metroid Prime is a monstrous mutant metroid that derives its power from phazon. It is also the source of the phazon corrupting Tallon IV. It is the final boss in Metroid Prime, first appearing as an enormous crablike creature and then in its true form as a floating tentacled creature that bears some resemblance to a normal metroid. After absorbing Samus' DNA and phazon suit, Metroid Prime appears in later games as Dark Samus.
the final boss in metroid prime is (kinda obvious) metroid prime. BUT! once you kill metroid prime, you have to fight his soul. I believe the only way to harm metroid primes soul is with the phazon beam. He is very hard to beat if you're not an experienced player.
Gorea
In the Impact Crater on Tallon IV. He is the final boss.
first boss in metroid prime is parasite queen
The Omega Metroid.
After defeating Ridley, Kraid, and the Mother Brain and successfully evacuating the planet, Samus's ship is shot down, and her power suit stripped. Armed with only a emergency pistol, you must recover your suit to win. Final Boss: Robotic Ridley.
phantoon
Gorea.
The Octoliths are needed to open the way to the final boss. All eight are needed in the Alimbic Cannon Control Room on Alinos.