Dr. Doom and Magneto #14 (Marvel Comics, 1977)

In "Dr. Doom and Magneto" #14, released in 1977, the ultimate villains of the Marvel universe unite for a diabolical scheme that threatens the world's heroes and their fragile peace. As Doctor Doom leverages his technological prowess and Magneto commands the forces of magnetism, the two masterminds clash with unexpected challenges from both the Avengers and the X-Men.