|The Marvel Superheroes consisted of five different segments, each starring a well-known superhero from a particular Marvel comic-The Sub-Mariner, Captain America, The Incredible Hulk, Iron Man, and Thor.
Iron Man was another Stan Lee creation. While in Vietnam to see his weapons designs tested out first-hand, millionaire inventor Tony Stark was struck in the chest with a piece of shrapnel. In order to keep himself alive, Stark jerry-rigged an armored suit, part of which acted as an external pacemaker to keep his damaged heart alive. But the benefits were much more than medical: as Iron Man, Stark possessed the powers of flight, super strength, and an array of weaponry. After the war, Stark used his wealth and technology to make numerous modifications to the suit, the beter to help him fight criminals like the Mandarin.
In order to meet the demands of presenting so many characters each week, the stories were told in a cliffhanger format, requiring fewer scripts. The creators also saved time through the use of Xerography, a process developed for Disney's 101 Dalmatians that allowed animators to copy pencil sketches directly onto animation cels, thereby saving them from having to redraw any scenes. While this technique resulted in a severe stiffness of the characters and almost no movement, it allowed the animators to churn out regular battles between our heroes and their super-powered nemeses.
Despite the limited animation, The Marvel Superheroes won its share of loyal fans. Namor, Captain America, and Thor continued to appear in later Marvel cartoons, and The Incredible Hulk and Iron Man later got shows of their own.