Hi,

I vaguely remember seeing this cartoon when I was a kid, in the '80s, so most probably it was from that decade or late 70s.
The only thing I remember is that the hero had a big gem/half sphere (probably red or green) on his chest(as an armor or sort of) attached with two belts as an X.
Hope someone has a clue about this one because I don't really remember anything else...

I think that could be He-Man. It wasn't a half moon, but a cross or X and it's red. <a href="http://s18.photobucket.com/albums/b140/Puppenstein/?action=view&amp;current=he-man.jpg" target="_blank"><img src="http://i18.photobucket.com/albums/b140/Puppenstein/he-man.jpg" border="0" alt="Photobucket"></a>

Yes, I was thinking about whether I'm confusing it with He-Man. Even though I cannot rule out the possibility, I think that it was not He-Man...