In Metroid fusion, interstellar bounty hunter Samus Aran is attacked by an X parasite while exploring the mysterious planet SR388. Not only is this organism deadly, but it can mimic the abilities of any creature it infects, including Samus himself! Rescued from the edge thanks to an infusion of Metroid DNA, the X Parasite’s only natural predator, she soon discovers that the parasite has spread to the research station orbiting SR388. Weakened and out of options, Samus must do whatever it takes to destroy the X threat before it’s too late.