The Batman: Gotham PD Spinoff Series on HBO Max Adds New Showrunner Giri/Haji creator Joe Barton as showrunner following the exit of Boardwalk Empire's Terence Winter. Announced for the HBO Max streaming service over the summer, the untitled spinoff takes place in the world Reeves imagined for The Batman and will revolve around the corruption-plagued Gotham City Police Department. The prequel, set in "Year One" of the Batman's (Robert Pattinson) costumed crime-fighting career, examines the new world created for the feature film "in the kind of depth and detail that only a long-form format can afford," Reeves said when announcing the untitled series in July.