Duel Monsters GX (遊☆戯☆王デュエルモンスターズGX, Yū-gi-ō Dyueru Monsutāzu Jī Ekkusu) is the fourth addition to the Yu-Gi-Oh!

The season begins with the dinosaur-obsessed drill sergeant Tyranno Hassleberry joining the Academy.

The true evil behind the Society begins to show itself, brainwashing the Academy's students, including several of Jaden's friends.

At the same time, the "Genex Tournament" begins in the school, with students and pros alike competing.

Jaden and the others work together with Aster Phoenix to save the world and free Sartorius from the evil that controls him.