The 1988–89 NHL season was the 72nd season of the National Hockey League. The Calgary Flames won an all-Canadian Stanley Cup final against the Montreal Canadiens four games to two. This remains the last time two Canadian teams faced each other for the Stanley Cup. Regular season This year saw the start of Wayne Gretzky's tenure with the Los Angeles Kings, having been traded in the off-season after leading the Edmonton Oilers to the 1988 Stanley Cup. Coinciding with Gretzky's acquisition, the team also changed its uniforms and colours for 1988–89, scrapping the purple and gold associated with its co-tenant at the Great Western Forum, the NBA's Los Angeles Lakers, in favour of black and silver. Gretzky's presence signaled a dramatic on-ice turnaround for the Kings. Prior to his arrival via trade with the Edmonton Oilers on August 9, 1988, Los Angeles had the fourth-worst record in the NHL at 30 wins, 42 losses, and 8 ties. After Gretzky's first season with the Kings, however, they moved all the way up to fourth-best in the NHL, with a record of 42 wins, 31 losses, and 7 ties for 91 points. They also managed to defeat Gretzky's former team, the Oilers, in seven games in the Smythe Division Semifinal before falling victim to a four-game sweep at the hands of the eventual Cup champion Flames in the Division Final. Four years after Andy Van Hellemond became the first on-ice official to wear a helmet, the NHL also made helmets mandatory for its officials like it did with its players in 1979; like the ruling for players, any official that was not wearing a helmet before the ruling could also go helmetless if they so desired. Mario Lemieux of the Pittsburgh Penguins won the Art Ross Trophy for the second consecutive season, leading the league with 199 points and recording all three of his eight point games in his career, with one of them happening during the playoffs. Lemieux remains the only player other than Gretzky to approach the 200 point plateau (Gretzky surpassed the 200 point mark four times in five years during the 1980s). This was the only season that there were four players that scored 150 or more points; Gretzky tallied 168, while Steve Yzerman and Bernie Nicholls totalled 155 and 150 points, respectively. This was also the only time that two teammates, Gretzky and Nicholls of the Los