Walkthrough: After defeating Queen Metroid and saving Baby Metroid, Samus' journey appears over, and the two head back to her ship. However, as Baby Metroid heads for the gunship, Proteus Ridley will appear out of nowhere and snatch the little guy. You will then have to battle Ridley in order not only to save Baby Metroid, but also to win the game. If you need help defeating Proteus Ridley, check out our exclusive guide on How To Defeat Final Boss Ridley!
Once Proteus Ridley is finally defeated, both Samus and Baby Metroid will hop into her space ship, and the two will then safely leave the planet of SR388.