A frightening X Parasite that copied Samus Aran's abilities on one of her trips to SR388 and dwelled within her until it was surgically removed. The infected Power Suit was transported to a B.S.L. Research Station in orbit above SR388. But it escaped its containment cell and set free all the X Parasites in the Quarantine Bay. It then spread all over the station, wreaking havoc and contanimating all the breeding enviroments. Samus was sent to the station to find all crew members dead and the X at the thier full potential. She prevailed by defeating the SA-X and sending the station plummeting toward its doom, destroying SR388 for good.