Subject Alpha

Subject Alpha is a boss who appears in Cyber Shadow. He appears in the middle and the end of chapter 5 "Research Lab" in two different forms.

While the game does not confirm it, the script strongly hints that Subject Alpha is the original, human Shadow that Cyber-Shadow was based off of - he seems confused by Cyber-Shadow and seems to think that Shadow's Locket is his, and that would match up with all of the ninja clan being captured and drained of their powers.