It was announced several months ago that Gary Oldman would star in David Fincher's next film Mank, and now the gifted director has assembled the rest of the cast, as Amanda Seyfried, Lily Collins, The Souvenir sensation Tom Burke and Game of Thrones star Charles Dance have joined the ensemble along with Arliss Howard, Joseph Cross, Ferdinand Kingsley, Jamie McShane, Sam Troughton, Toby Leonard Moore, Tom Pelphrey and Tuppence Middleton. Netflix is backing the black-and-white film, which finds Oscar winner Gary Oldman playing Citizen Kane co-writer Herman J. Mankiewicz. The story will follow Mankiewicz’s tumultuous …