Bloodshot

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The protagonist is Angelo Mortalli, a ruthless killer for the mob who is set up by the family and framed for a murder. He instead goes into Witness Protection, but is betrayed by an FBI agent guarding him, kidnapped and forcibly subjected to an experimental program in which his body is injected with microscopic computers called nanites. They erase his brain and rebuild it and his body to be a weapon with superhuman strength and healing powers. Bloodshot escapes his makers, and though he isn’t his old self, he tries to figure out who he was. Things get bad for everybody who betrayed him.