Original: They came tantalizingly close to reaching the Stanley Cup semifinals in 1975, but were ousted from the playoffs by the New York Islanders in one of only three best-of-seven game series in professional sports history where a team came back from being down three games to none.
Simplified: They missed the semi-finals in 1975 because they lost four games to three to the New York Islanders after being ahead three games to none.