The Ice Bowl, an epic contest between the Green Bay Packers and the Dallas Cowboys, was the coldest pro football game ever played. It pitted Vince Lombardi and the Packers’ 1960s dynasty against Tom Landry and the up-and-coming Cowboys. The challenge of playing against a strong opponent was compounded by the brutal, sub-zero temperatures. In a heart-pounding thriller, players and fans alike proved their mettle. In addition to the Ice Bowl, the 1967 season in pro football was notable for introducing breakthroughs in the game and playoff format. In this period, the National Football League and the American Football League continued their fierce competition. This rivalry would set the foundation for the modern NFL.