Rory Kinnear (Karl Marx), Nicholas Burns (Willich), Nancy Carroll (Jenny von Westphalen), Oliver Chris (Friedrich Engels), Laura Elphinstone (Nym), Eben Figueiredo (Schramm), Tony Jayawardena (Gert “Doc” Schmidt), Scott Karim (Grabiner/Singer), Alana Ramsey (Mrs. Mullet), Sophie Russell (Librarian), Fode Simbo (Peter), William Troughton (Constable Crimp), Joseph Wilkins (Sergeant Savage), Duncan Wisbey (Mr. Feece/Bearded Man), Miltos Yerolemou (Emmanuel Barthélemy)