The Human Core-X is an X Parasite that mimicked a Human crew member. In an attempt to destroy Samus and protect the X living outside the B.S.L research station, the Human Core-X deactivates the cooling unit of the station Main Boiler potentially detonating the auto destruct system.
From this Human Core-X, Adam infers that this particular human was alive until recently, prompting Samus to look for more survivors but finding only the Dachora and Etecoons. Adam also realized that the X work heavily toward self-preservation of the species, even at the cost of the individual organism.
- "The X mimicked a crew member." —Adam Malkovich (Metroid Fusion)
- "It seems the Main Boiler's cooling unit is malfunctioning. This could easily destroy the entire research station, as it would likely trigger the auto-destruct explosives." —Adam Malkovich (Metroid Fusion)
- "This could have destroyed the station with the X in it, not to mention to SA-X. Unusual for a self-preserving species like the X. Unless... Your presence is an even greater threat, a threat to the existence of X elsewhere..." —Adam Malkovich (Metroid Fusion)