This is the last part of the Marvel Superheroes Show. We covered the rest back in May when "Marvel's The Avengers" hit theatres. Prince Namor, the Sub-Mariner, would eventually join the Avengers himself, but not until the late 80's. Currently in the comics, he's aligned with the X-Men, all because he himself is a mutant.
Namor and Captain America had one thing in common. Both were introduced in the Golden Age, and revitalized during the Silver Age. Sadly, the aninated Namor had been hamstrung by some poor adaptations of his adventures, including one that marked the television debut of the X-Men. Surely, Namor deserved better than that.
Anyway, Fabster3333 uploaded the brief, cheesy open.