In 1940, as part of the "War Exchange Conservation Act", Canada banned the import of pulp magazines. Popular launched a Canadian edition of "Astonishing Stories" in January 1942, which lasted for three bimonthly issues and reprinted two issues of "Astonishing" and one issue of "Super Science Stories". With the August 1942 issue the name was changed to "Super Science Stories", and the numeration was begun again at volume 1 number 1; as a result the magazine is usually listed by bibliographers as a separate publication from the Canadian "Astonishing", but in many respects it was a direct continuation. The price was 15 cents throughout; it lasted for 21 regular bimonthly issues in a single volume; the last issue was dated December 1945. It was published by Popular Publications' Toronto branch, and the editor was listed as Alden H. Norton.