Zombie Researchers are the researchers onboard the B.S.L research station that have been infected by the X. They appear only on the Main Deck. Like several other creatures encountered that have combined DNA, they are likely a combination of human DNA and that of a slime creature. Zombie Researchers are weak compared to many other X mimicked creatures that Samus encounters, being defeated by a single shot from the Power Beam. After being destroyed, Zombie Researchers release either a Yellow X or a Green X. The X can indefinitely regenerate them by entering a downed body of a Zombie Researcher.
Adam points out that Zombie Researchers were useful to the X as humans in gaining knowledge and as sustenance, but their combat abilities are remarkably low.
Although X-mimicked humans seem to transform into Zombie Researchers, one dead human mimicked by the Wide Beam-wielding Hard Core-X did not transform into a Zombie at all. Instead, it looked like a normal human before it transformed to its true X form. Adam remarks, however, that this human may have been alive recently, meaning the Zombie Researchers must have been dead a while.
- Zombie Researchers are the only enemies appearing in the Fusion manual that were not mimicked versions of enemies that appeared in earlier games.
- "These shambling creatures are probably the result of X parasite absorbing a slime creature's DNA then infesting the staff researchers. They're remarkably similar to zombies." Metroid Fusion Instruction Booklet, Pg 39
- "So the survivors were not human... Most unfortunate. We can now confirm the deaths of all crew members. I imagined this was the case, but I had hoped it wasn't so. I believe the X only infected the humans for knowledge... That form is too weak for battle. I am sure the others were merely food for the X... Samus, I think they are evolving, growing stronger. Some are now appearing that resist your current weapons. HQ anticipated this and sent Power Bomb data as soon as the hardware team finished it." —Adam Malkovich (Metroid Fusion)
- "Don't let your guard down yet. The X are still a threat. Samus, I see bio-signs on the Habitation Deck. Survivors? The infected crewman you saw had survived until recently. Maybe there's a chance... The signs emanate from here." —Adam Malkovich (Metroid Fusion)