What if Joe Simon and Jack Kirby had not picked Leader News to be the comic book distributor for Mainline Comics--their ill-fated self-publishing venture back in 1954. We might very well have witnessed them invent "The Mainline Age of Comics" by the time the 1960s Second Super-Heroic Revivals were in full sway. Mainline Comics most likely would have introduced us in some form to Challengers of the Unknown, The Fly and/or Spider-Man, The Hulk, Iron Man, Thor, quite possibly The X-Men, etc. Simon &_Kirby would have owned whatever was created in the early '60s, lock, stock, and barrel.