MacGyver (2016) Season 4, Episode 9 : Code + Artemis + Nuclear + N3mesis

While Mac's friends surround him during his time of grief, Los Angeles' power grid is taken hostage in a ransomware attack resulting in a citywide blackout, and the team discovers the code used was written by Riley years ago. Guest Stars: Sea Shimooka, Holly Deveaux, Delaney Williams, Randy Havens, Dean Cudworth, Ramón De Ocampo, Tate Donovan,

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