The 23-year-old goalie, who is 12-7-2 with a 2.21 goals-against average and .927 save percentage in his second season with the University of Toronto, did not face a shot after entering the game with a face-off in the Maple Leafs' zone.
"First thing [I thought] was hopefully they win the [defensive]-zone draw and get the puck out and nothing comes at me," Alexander said. "But yeah, it was pretty special. Pretty nerve-racking obviously, but something I'll remember."
"Whether you get a shot or not, it was 70 seconds on the ice and a game played in the NHL."
Alexander said he did not get much notice that he would be entering in relief of Ilya Samsonov, who made 20 saves.
"It was just 'Jett, you're going in,'" Alexander said. "I took my hat off, hoped over the boards and kind of blacked out, I guess. It was pretty cool. Didn't really think too much about it. I didn't think that would be something that happened, but it's a pretty cool way to end the game and something I can have under my belt forever."
The Maple Leafs signed Alexander after Matt Murray was unable to back up, still dealing with the effects of a head injury sustained in a 5-2 loss to the Detroit Red Wings on Sunday.
Alexander also served as an emergency backup for the Colorado Avalanche against the Maple Leafs on Dec. 1, 2021, for the first period of an 8-3 Toronto win. Justus Annunen, who was recalled that night from Colorado of the American Hockey League, took over in the second period upon arriving at the arena.
Alexander grew up in Bloomfield, Ontario, about a two-hour drive east of Toronto.
"Being a Leafs fan for a very long time, it's pretty special when you get to put that jersey on and just be out there and sitting on the bench just taking it all in was a dream come true, honestly," Alexander said.