The violence is extremely mild compared to the older superhero cartoons and especially the more modern ones.
The violence was very mild, although it was a step up from the 1973 series. There were scenes in which the entire Earth was in peril, even scenes in which entire planets were going to collide, and Superman couldn't stop it. But no on-screen death or blood, punching etc.
There is an episode where a girl is kidnapped, and although it is never stated, it seems pretty clear that the kidnapper intends to do something violent to her, probably rape.
One episode shows violent teenagers vandalizing a school and setting it on fire.
Very mild violence throughout the show. Although it was a superhero action series, the violence was heavily toned down for Saturday morning. Combat scenes featuring punching or shooting were not allowed. Typically the most violent act seen might be someone getting thrown by another opponent, only to land safely and unharmed.
This season was aired during a time in the history of Saturday morning cartoons in which shows like Transformers and G.I. Joe were allowed to feature more violence then what was previously allowed due to censorship. This is evident this season. In fact, even in the opening theme, Apache Chief can be seen punching a villain in the face, and even though it was a robot, such physical violence was pretty much never tolerated in the series prior to this season.
The violence was mostly mild, although it was by far the most violent of the Superfriends series. There was lots of superheroes and supervillains fighting, including showing characters getting shot with lasers, omega beams, blown into space, injured, tortured and knocked out. Still, no on screen deaths were shown this season, and death itself was only referenced a couple of times in the series.
In one episode, a young boy witnesses his parents get murdered in front of him in an alley. It's clear they were killed by a gun, although it wasn't shown or heard, as thunder had struck as the two shots were fired.
In one episode, one of the main characters was seemingly killed off. Although he was actually only comatose, his skin was gruesomely discolored, making him green. That same episode featured a different superhero getting tortured by Darkseid and Desaad.