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Jharrel Jerome
Harry Treadawaystars. (Remember Dr. Victor Frankenstein from Penny Dreadful?)
The cast also includes Brendan Gleeson (28 Days Later), Mary Louise-Parker (Weeds), and Jharrel Jerome (Moonlight).
From Den of Geek: Mr. Mercedes TV Series Release Date, Cast, Photos, & Everything Else They Know
Dark Matters 