Alvin and Millie are apparently both dogface children and friends of Morty's. These tales take place during the late 1950s through the early 1970s when Ferdie had been dropped from the "Mickey Mouse" strip by Gottfredson, and Morty was then living twinless with his Uncle Mickey Mouse. Alvin first appeared in the Mickey Mouse daily strip on January 26, 1957. Eight years later, Millie was introduced to the Mickey Mouse daily strip on February 3, 1965.