I think I know what you're talking about, but I don't think it was a nuclear war. Didn't the moon like break or something? For the life of me I can't remember the title either. AHHH!!! If it wasn't the one with the broken moon then which cartoon was it. It was an old one too. You guys remember Richie Rich? I hated that guy...always had the cool things I could never have!! =P
If you are reading this, you obviously have nothing better to do with your time.