Code + Artemis + Nuclear + N3mesis

S4, E9: Code + Artemis + Nuclear + N3mesis

Available on iTunes, Paramount+, Prime Video
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.
Starring Tate Donovan, Sea Shimooka, Holly Deveaux