SR388 is the main planet in Metroid II: Return of Samus. This is considered home to many creatures, such as the Metroid. In Metroid 2, Samus Aran goes around SR388 destroying the several evolutionary forms of Metroids. Eventually, Samus gets tot he heart of SR388 and an all-out battle with the Queen Metroid begins. Samus defeats this big creature. On her way back to her ship, a Metroid Larva hatches right before her eyes. Samus takes the baby back to scientists for further investigation.