History of organizational changes in the NHL
The 1966-67 NHL season was the last year of the Orginal Six era because in the 1967-68 NHL season, there were 12 teams, or twice as many as there were the year before. The new six teams were the California Seals, the Los Angeles Kings, the Minnesota North Stars, the Philadelphia Flyers, the Pittsburgh Penguins and the St. Louis Blues. During this season, California was renamed the Oakland Seals.