US TV animation had occasional flashes, too. The 1960s Grantray-
Lawrence syndicated "Marvel Super Heroes" cartoons were adopted,
with a few changes, from various Marvel comics by Stan Lee, Jack
Kirby, and others. ["Captain America", "The Incredible Hulk",
"Iron Man", "The Mighty Thor", and "The Sub-Mariner". ] These had
ongoing storylines, as did the comics they were based upon.
The Spider-Man and Fantastic Four series were more traditional
all-done-in-a-half-hour versions in their 1960s incarnations.
https://en.wikipedia.org/wiki/The_Marvel_Super_Heroes
> Old Doctor Who had arcs, but no little or no continuity between arcs.
> It didn't matter if you watched "The Power of the Daleks" or "The
> Smugglers" first - aside from the change-out of companions, and the
> rarer change-out of Doctors, there was no way to tell which comes
> first in-story.
>
> Dr Who also was, and is, open-ended. There's no plan to end it as
> long as it makes money, which constrains possible plot lines.
>
> B5 was conceived as a single story, with a beginning, middle, and
> end. Events from season 1 have unexpected (to the viewer) consequences
> even near the end of the show.
What was amazing was, given the cobbled-together near-network that
was the PTEN distribution, which degraded to just about a mere
syndicator by the end of the run, that it managed to stay on as
long as it did!
https://en.wikipedia.org/wiki/Prime_Time_Entertainment_Network
PTEN could be seen as a proto-UPN, which broadcast ST:Voyager.
Kevin R