A 30-minute documentary from HBO, "Atlantic City: The Original Sin City." It's a companion piece to the series, and originally aired on HBO just prior to the series premiere. It includes interviews with many of the experts on Atlantic City history, including Nelson Johnson (author of Boardwalk Empire), Allen "Boo" Pergament, Heather Halpin Perez, Ralph Hunter, Vicki Gold Levi, Turiya S. A. Raheem, and Bryant Simon. It also includes executive producers Martin Scorsese and Terence Winter, as well as the research advisor for the series, Ed McGinty.