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.