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After a violent mugging leaves Grey Trace paralyzed and results in the death of his wife, he is hospitalized and struggling with his new limitations. A wealthy inventor approaches Grey with an experimental solution: an artificial intelligence implant named STEM designed to restore and enhance his physical abilities. Once implanted, Grey regains the ability to walk and discovers he has gained extraordinary strength and agility. Using these new abilities, he sets out to track down and confront the criminals responsible for the attack that changed his life.