When the NHL formed in 1917 his Quebec team dispersed their players throughout the NHL, Malone landed with the Montreal Canadiens where he became the first scoring leader in the history of the league. Averaging 2.20 goals per game in his first NHL season, it is far and away the highest goals per game average in the history of the league. He scored 44 goals in just 20 games. It would be impossible to keep up that pace in the modern day NHL, but just to put it in perspective, if someone could they would score 180 goals in a season. In his first NHL game he scored 5 goals against the Senators in Ottawa, which is the record for any Candiens player for goals in a road game. He also scored at least one goal in his first 14 games in the NHL, that streak is the second longest scoring streak in the history of the league. Malone would return to the Bulldogs after they resumed operations in 1919 and he continued his scoring.
The night he scored 7 goals, his Bulldogs were struggling with a 1-10 record and their opponents were a game under .500 with a 5-6 record of their own. Both teams were out of contention, so it was hardly the premier matchup of the night, considering the Ottawa Senators were hosting the Montreal Canadiens with a playoff spot on the line. Even with that being the case Malone would make the game one to be remembered. He scored his first goal almost 7 minutes into the first period, Toronto's Ivan "Mike" Mitchell kept him from putting the biscuit in the basket the rest of the first but an offensive explosion was on the way. Just 50 seconds into the second period Malone notched his second goal of the game, then added two more before the period was over. With 4 goals already Malone was on fire and the Toronto coach decided to try his backup goalie Howard Lockhart, the St. Pats tried desperately to get back into the game as they cut the led down to 7-6 in the third before a 5 minute major against Toronto set Malone up for his fifth and sixth goals of the game. He would light the proverbial lamp one more time late in the game scoring his historic 7th goal and preserving a 10-6 win for the Bulldogs. It was an absolutely dominating performances by one of the best players of his time.
Only two players have come close to the record in the modern era, St. Louis' Red Berenson in 1968 and Toronto's Darryl Sittler both scored 6 goals but couldn't match what Malone had done. Here is a list of player who scored 5 goals or more in one game: http://en.wikipedia.org/wiki/List_of_players_with_five_or_more_goals_in_an_NHL_game
Here is a look at his stats: