May 13 1980: Denis Potvin Scores the First Overtime Power Play Goal in Stanley Cup Finals History

On May 13, 1980, New York Islanders defenseman Denis Potvin scored the first ever overtime power play goal in the history of the Stanley Cup Finals. The goal gave the Islanders a 4-3 win over the Philadelphia Flyers. Potvin considered the goal a defining  moment in his career as they took the first game of the series on the road. It was the only victory for a visiting team in the series that went 6 games. 11 days after Potvin's overtime winner the two squads would head to overtime once again, a little over 7 minutes into the extra frame Bobby Nystrom scored the game winner to give the Islanders a 5-4 victory. It was the first of 4 consecutive Stanley Cup Championships for the Islanders.