Marvel Superhero Comics, Key Issues, MARVEL (15). Collection of 15 comic books featuring Marvel Superheroes and Villains including some Key Issues. Key Issues: Super-Villain Team-Up #14 - First meeting of Doctor Doom and Magneto; Sub-Mariner #22 - First meeting of Doctor Doom and Magneto; Warlock #10 -Origin of Thanos and Gamora and more. All comics arrived bagged and boarded. Items range from average to above average condition for circulated comic books of their age. See photos for more details on condition and contents. There may be wear and tear not visible in photos or detected at inspection.