Does any of the yugioh cast ever duel in yugioh GX?
If you mean the cast of the first yugioh season, then yes. In the final episode of GX, Yugi battles Jaden but the final result of the duel was never shown (maybe because Jaden started crying like a little girl afterwards). Also Kaiba showed up in one episode because he made the school, but I don’t know which one. He also duels Trueman near the end of the series and is the last person in Domino after the attack. Pegasus shows up a few times and duels once against Cronos and Napoleon. Plus Mai and Jonouchi are referenced.
