|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 Sub-Mariner" was the title given by surface dwellers to Prince Namor of Atlantis, a half-human, half-Atlantean. More anti-hero than superhero, Namor hated all surface-dwellers regardless of who they were. As luck would have it, the moody prince often found himself fighting against polluters or other villains who wanted to hurt his underwater home as well as the innocents on land. Blessed with super-strength and the ability to fly using wings attached to his feet, The Sub-Mariner would repel any threat to Atlantis and usually ended up helping the “land-lubbers” he so disdained.
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.