Probably along with the Spectacular Spider-Man animated series (ok, maybe a close second), Fantastic 4: World's Greatest Superheroes is one of the best animated tv-series episodes I've seen and collected, which is currently "clogging up" my laptop. Too bad it only ran for 26 episodes, and got quite limited showing on Cartoon Network back in 2007. Based on the popular Marvel comic book series, this cartoon produced by Moonscoop a France-based animation company, two-dimensional art and three-dimensional computer animation with slick intro sequences and excellent voice acting and action sequences. Any true fan of the Fantastic Four should not miss watching the series as it features some of the more poplular superheroes and villains from the Marvel Universe (as well as not so known ones).
Simply copy and paste the shown download links below mostly from Rapidshare and some on Megaupload to a notepad or directly to your download manager. The file sizes are about 25mb each on the average and can be viewed on a 320x240 screen size, fitting most MP4/3GP devices.