Goaltender Frank "Ulcers" McCool played his minor hockey in his hometown of Calgary and played in the 1938 Memorial Cup with the Calgary Canadians. From 1940 to 1942, McCool was enrolled at Gonzaga University, where he played a total of eight games for the school's hockey team.
In 1943, McCool played with the Calgary Currie Army and was out of hockey altogether in 1943-44 due to World War Two. Upon returning to hockey, McCool signed a free-agent contract with the Toronto Maple Leafs in October, 1944. That year, McCool was given the number one goaltending job and appeared in 50 games. Despite a regular season record that was barely over .500, McCool guided the Maple Leafs to the Stanley Cup that year. McCool played another 22 games with the Leafs in 1945-46.