The Toronto Maple Leafs signed Unger to a C-form in the days before the creation of a entry draft.
Garry Unger could not have known what was in store for him when he was interested into the Maple Leaf line-up on February 24, 1968 between Mike Walton and George Armstrong. Coach Punch Imlach had brought up the rookie in an effort to make the playoffs and to fill in for Dave Keon, who had been injured. The centre would stay in an NHL line-up through to the 1979-80 season, smashing the existing iron-man record by 284 games.
Unger set an NHL record by playing 914 consecutive games in the regular season between February 24, 1968 and December 21, 1979, doing so with four teams: the Toronto Maple Leafs, Detroit Red Wings, St. Louis Blues and Atlanta Flames
On December 22, 1979, Flames coach Al MacNeil finally benched Unger, ending the streak at 914 consecutive games.