Martin Mystery is, literally, an international hero.
Based on a series of Italian comics, which were imported to the US by Dark Horse Comics several years ago, Martin Mystery made the transition to television in 2003, airing here in the US on Nickelodeon and its sister networks. A collaboration between France's Marathon studio (Totally Spies!) and Japan's Tatsunoko (Speed Racer), Martin went out of production in 2006, and, despite rumors of a planned revival as recently as last year, nothing has been done since. I should note that the comics didn't fare too well here in the US, either.
Here's the open:
I didn't see enough of the show to properly rate it.