Metroid Prime Samus first stopped the evil Space Pirates and Mother Brain from amassing an army of Metroids on the planet Zebes. Then she was called on to finish the job on SR388, ultimately ridding the universe of all but a single Metroid larva. In Super Metroid, for the Super Nintendo Entertainment System, Samus thwarted Mother Brain's attempt to snatch the captive Metroid larva from the scientists on Ceres. Now, Samus is once again called to investigate Space Pirate activities on the unexplored Tallon IV. Her adventure begins as she enters a mysterious derelict.