We have weird world-beating menaces, ancient threats from prehistoric times, supernatural menaces, mad scientists galore, and plenty of Axis powers buffoons who want to threaten the tranquility of the common man. That these cartoons are so widely available makes folks think that perhaps they are valuable. But like peanut butter, just because it's relatively cheap, don't imagine it's not exquisite. And that's true for these animated adventures.
I won't bother to rumble through a summary of the cartoons. The Superman Homepage does a much better and more detailed job of it. If you've never seen any of these masterpieces of animation or just want to get another look, then take a gander at this.
These are the best of the best. Highest recommendation!