I've watched shows like The Simpsons, Family Guy, Spongebob, etc. wherein each episode feels somewhat disconnected. In shows like Arrow, The Flash, and others, each episode builds up to a series finale, and changes made in one episode are often permanent and relevant.
However, in in shows like Spongebob, the titular character and his friends can all be blown up in one episode, but they never mention it (nor show evidence of it) in any future episodes. If Gary died in one episode, he would still be a main character after that episode. So again, what is it called when a show's episodes are not on one continuous timeline, and changes rarely stick?