I have never seen it, but I read a lot of Donald Duck comics in my childhood during the 80s. I have also read newer comic books but it seems they are only working alone. Donald and Goofy both lives in Duckburg, so it's strange they seem to have never heard about each other's superhero identities either. I wonder if both of them would think of the other as disturbing/annoying, and maybe they would even fight each other. EDIT: As Donald Duck comics often deals with both aliens, criminal geniuses and evil witches.... maybe there would be a need for Super Goof to ask Duck Avenger for help sometimes?