Along with the other four superheroes featured in Grantray Lawrence's Marvel Superheroes series, all the music featured dramatically throughout the episodes were effectively recycled from Trevor Duncan's stock library that had most notably used tracks as the main theme and incidental music in Quatermass and the Pit (1958). The only music specially composed for the series were the main title theme for each individual hero and the (now rarely seen) Marvel Super Heroes main title intro song and the Merry Marvel Marching Society song which played over the end credits.
This was the Sub-Mariner's sole animated series. The character was Marvel Comics' first and mightiest mutant, and had been a staple of Marvel Comics since the early 1940s, when he was first introduced. It was also the series in which the Uncanny X-Men made their television debut, in Dr. Doom's Day (1966). The plot was based on a Fantastic Four story, but because their television rights belonged to Hanna-Barbara, the Four were supplanted by the X-Men.