Yu-Gi-Oh Duel Monsters is the second animated Yu-Gi-Oh series, produced by NAS instead of Toei. The animation style differs greatly from that of Toei, as does the storyline and title. While the original Toei series was the first to be produced, it never finished following the manga's storyline, and abruptly ended after 28 episodes. On the other hand, Yu-Gi-Oh Duel Monsters ran for 224 episodes, 5 seasons, and for several years. It is also the animation that most people think of when they hear "Yu-Gi-Oh!", as Yu-Gi-Oh Duel Monsters was imported to several different countries under that simplified name (not to be confused with the original Toei series though, which is also just "Yu-Gi-Oh!"