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.
The Norse god masqueraded as scrawny human Dr. Donald Blake, but when the doctor tapped his walking stick, it became the mighty hammer Mjolnir, and Blake himself became the legendary God of Thunder. The powerful being spent most of his time defending the earth, but he would often return to his Asgardian home to converse with his father, the all-powerful Odin, or to foil the plots of his brother Loki, God of Mischief.
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.