I'll just leave this here (From the Prime Trilogy Art Booklet):
"Samus lived with her parents on the planet K-2L, a human colony in the Galactic Federation domain. When Samus was three years old, K-2L was attacked by a band of Space Pirates lead by the brutal ruffian Ridley. When the Space Pirates left and the smoke cleared, a single figure remained standing. It was Samus Aran, the sole survivor of the attack on K-2L.
Samus was rescued from the charred ruins of K-2L by the Chozo, a race of beings who resemble giant birds. They had received the colony's distress signal during the attack and came to assist. The Chozo took Samus back to their homeworld, Zebes.
Being a highly technologically advanced race, the Chozo crafted a power suit for Samus that gave her incredible strength. They trained her to become a fearsome warrior. Once her training was complete, Samus parted ways with the Chozo and became an intergalactic bounty hunter.
Samus carried out countless missions. Many that other bounty hunters deemed impossible. She became the most famed and capable bounty hunter in the universe, yet she was not fulfilled. Samus didn't become a bounty hunter to achieve fortune or fame. Her purpose was to avenge the death of her parents by slaying Ridley and the rest of the Space Pirates.
Before long, the opportunity to fulfill her purpose would arise."
