The Marvel Super Heroes was an animated cartoon series, first broadcast on U.S. television in the 1960s.
The low budget series used the technique of xerography; a process that involved the use of photocopied images from comic books, which were then manipulated to animate the characters.
The program had five segments, and each one featured the adventures of a popular Marvel superhero. Captain America, The Incredible Hulk, The Invincible Iron Man, The Mighty Thor, and Prince Namor the Sub-Mariner were the characters showcased by the show.
After searching around a bit, I was able to find the theme songs for all the superheroes on the show. Some of them are quite campy, but still great fun to watch.
The Incredible Hulk
The Invincible Iron Man
The Mighty Thor
Prince Namor the Sub-mariner