Originally a comic book character from the '40s created by Bill Everett, Sub-Mariner is the heroic alter-ego of Prince Namur from the underwater kingdom of Atlantis. In the late '60s, the character was part of an animated television series The Marvel Superheroes. This video contains a pair of episodes from the series.
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Sub-Mariner: Atlantis under Attack and we will let you know when it becomes available.