Alzner played four Western Hockey League (WHL) seasons with the Calgary Hitmen as part of a standout junior career. His last year he was Captain Alzner next Hitmen Captain His first game for the Hitmen was for the Christmas Teddy bear toss as an underage 15 year old with 14,000 fans in the Saddledome. Alzner was on Team Pacific Silver against Team Toews (West) Gold.  He was a Canada national team member winning in 2005 Memorial of Ivan Hlinka and Canada's gold medal-winning team at the 2007 World Junior Hockey Championships as one of only two players who had not been selected in the NHL draft (the other being Sam Gagner). Shortly after returning to Calgary after the World Junior Championships, Alzner headed to Quebec City, Quebec to play in the 2007 Top Prospects Game and Alzner was named Captain of Team White and Sam Gagner was Captain of team Red.