The scientists' findings were astounding! They discovered that the powers of the Metroid might be harnessed for the good of civilization! I personally delivered it to the Galactic Research Station at Ceres so the scientists could study its energy producing qualities. I completely eradicated them except for a larva, which after hatching followed me like a confused child. I next fought the Metroids on their homeworld, SR388. It was there that I foiled the plans of the Space Pirate leader Mother Brain to use the creatures to attack Galactic Civilization.
I first battled the Metroids on planet Zebes.