Directed by Peter Berg, this entry in ESPN's documentary series 30 for 30 explores the changes that occurred in the National Hockey League after the game's biggest star, Wayne Gretzky was traded from the Edmonton Oilers to the L.A. Kings. By playing in the United States, Gretzky caused something of a renaissance for the sport there, but in Canada, where hockey is the most popular sport, the trade was met with outrage. ~ Perry Seibert, Rovi