The last Superman cartoon was Superman: The Animated Series and that ended 20 years ago in 2000. This Superman's story continued into the Justice League/Justice League Unlimited cartoon, but why hasn't there been another solo Superman cartoon since 2000 when Superman: The Animated Series ended? Is it because people think a new solo Superman cartoon won't live up to the reputation status of Superman: The Animated Series? I doubt that has to be the case because there have been more solo Batman cartoons since Batman: The Animated Series/The New Batman Adventures and Batman Beyond but they didn't live up to the reputation of those Batman cartoons. Could it be copyright issues with Superman or something else entirely?