Yu-Gi-Oh! GX (遊☆戯☆王デュエルモンスターズGX, Yūgiō Dyueru Monsutāzu Jī Ekkusu?, Yu-Gi-Oh! Duel Monsters GX in the Japanese language version) is an anime spin-off, and sequel of the original Yu-Gi-Oh! franchise. It first premiered in Japan on October 6, 2004. Yu-Gi-Oh! GX follows the exploits of Jaden Yuki (Judai Yuki in the original Japanese version) and his companions as he attends Duel Academy.

Source: Wikipedia