Duke Devlin originally arrives on a mission: to get revenge on Yugi Moto for ruining his chances for a great game success. You see,
Duke likes duel monsters, but his real love is dice. So he decided to develop a way to combine those two ideas into one new game:
Dungeon Dice Monsters. He decided to submit his game idea to Industrial Illusions to see if they would distribute the game.
Pegasus himself invited Devlin to Duelist Kingdom to try the game out. Pegasus used his Millennium Eye to cheat and win the
game, but the complimented Devlin on such a fascinating concept. He said he'd begin work on the game soon, but he had a
tournament about to begin on the island. Devlin left the island with a marked respect for the man. Yugi then beat Pegasus
at the end of the tournament, and ever since then, Pegasus has been out of the picture and Devlin was mad.

To him, Yugi robbed Devlin of his chance, and he couldn't believe that Yugi could beat Pegasus at the game that Pegasus created
himself. Thus, when he beat Joey and Yugi attempted to challenge to save Joey's face, Devlin set the challenge: a duel with Dungeon
Dice Monsters… and if Yugi lost, he'd never duel again. It was then Yugi managed to beat Devlin at his own game and Devlin realized
that Yugi was the genuine article: the King of Games. With that, he was able to make up with Yugi and the gang. Duke Devlin reappears
again at Domino High and in Battle City, first by coming to Tristan and Serenity's aid. To be the beginning of a rivalry… because both
he and Tristan are developing a crush on Serenity.