Game 6 of the Final at Enterprise Center on June 9, a 5-1 Boston win, was supposed to be it for Glenn, who said the ravages of multiple sclerosis on his body made it difficult for him to continue.
He said he was fine with retirement, but something kept gnawing at Glenn: the feeling of unfinished business. He needed to complete a hat trick.
"To do the NHL playoffs was on my bucket list, to do the [Stanley Cup] Final was on my bucket list, to do an All-Star game was on my bucket list," he said. "That was fulfilled."
Glenn's dream came true when officials from the NHL and NBC called about 10 days before the game and asked him if he would be interested in singing the U.S. anthem.
The answer was a quick "Yes!" Yet Glenn professed a slight case of nerves the night of the game. He needed a cane, a nod to his medical condition, to help him walk on the red carpet laid onto the ice surface. Glenn hadn't performed in front of a large crowd for what seemed like forever, he said.
Then muscle memory kicked in and Glenn didn't just sing the anthem. He belted it out as if he were on Broadway instead of Clarke Avenue.
"I tried to leave everything on the ice, everything I had," he said. "It was exhausting."
"Hockey Night in Canada" host Scott Oake summed up Glenn's performance on-air in three words.
"That was unbelievable," he said.