I don't remember where I read/heard this... He was a "Kaleesh" (correct me if I'm wrong) warlord. He was converted to a machine by Sidious because of a star ship crash which left only a couple of organs, his spine, and brain. Before this all, Grievous had a hatred for the Jedi. Sidious tampered with Grievous' mind making him more agressive. That's what I know.
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Originally posted by TheElectricFoxGah!!! I got tricked into following a SS link!!!
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