If he borrows from Seven of Nine for this, he borrows even more heavily from the Locutus of Borg arc from TNG. However, man/machine mix like that is hardly original. Six Million Dollar Man, for example. I remember seeing something once, or reading it, kind of like a Twilight Zone episode, where a guy had an advanced artificial arm and it eventually took him over and made him a killer.
I'd love to see what DeSanto could do with this idea, though.
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Dawg