The Chozo contained the source of the Phazon, and the survivors left the world. She discovers that the Chozo once settled on Tallon IV, and their disappearance, along with the emergence of Phazon, is due to an interstellar object crashing on the planet.

Samus receives a distress signal, and travels to Tallon IV to stop the Space Pirates from exploiting a substance called Phazon. After receiving a Fully Powered Suit from deep within the ruins of Chozodia, she returns to the Mother Ship, eliminates its onboard Ridley Robot, and makes off with an Escape Ship as it self-destructs. Stripped of her Power Suit and transportation, she is forced to infiltrate the Space Pirate Mother Ship in order to find another way off the planet, with only her Paralyzer for protection. In Metroid: Zero Mission, a remake of the original Metroid that replaces it in continuity, Samus is ambushed by Space Pirates while escaping the planet after killing Mother Brain, and her Starship crash-lands back on the surface. She confronts the cybernetic lifeform Mother Brain, as well as its guardians, Kraid and Ridley.

Samus travels through the caverns of planet Zebes to stop Space Pirates from exploiting the Metroid species for galactic domination. Timeline of the Metroid series Metroid/ Metroid: Zero Mission

1.7 Metroid II: Return of Samus/ Metroid: Samus Returns.

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