There was a Superman cartoon of sorts at the same time as Superman Returns, namely Legion of Super Heroes, which featured a young Superman as a cast member. (It was going to be Superboy and the Legion of Super Heroes, but they ended up not using the Superboy name. It's unclear whether that was due to the legal disputes over ownership of the title at the time or done in order to tie into Returns. But it premiered 3 months after SR was released and ran for two years.
They had him really thin. I think in the second season they had an edgy superman clone of sorts...