History.com: The Toys That Built America: Board Game Empires (S1, E4)

After failing to make a living selling lithographs, Milton Bradley creates one of America's first board games, which will go on to become one of the biggest of all time. But the Parker brothers threaten Bradley's reign. But it's a game about Monopoly that will upend the business. And in its earliest days, it might have been pirated from its true creator, who has been largely lost to history -- until now.