Mark Rolston plays Deathstroke in the Batman : Arkham Knight game .
Other villains include the pyromaniac Firefly ( Crispin Freeman ) , the beastly Man-Bat ( Loren Lester ) , the assassin mercenary Deathstroke ( Mark Rolston ) , the serial killer Professor Pyg ( Dwight Schultz ) , the religious fanatic Deacon Blackfire ( Marc Worden ) , and Hush ( also voiced by Conroy ) , who is impersonating Batman 's alter-ego as Bruce Wayne .
Batman-COLON- Arkham Knight