Yu-Gi-Oh! GX Episode 70: Asuka VS Manjoume White Thunder!
Episode 70 of 180 of Yu-Gi-Oh! GX, aired February 1, 2006, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Chazz beats one Obelisk Blue Student one after another, and preforms the unknown action of dying the entire Blue Dorm White. It is said that it is the "Association with the Light" which Sartorious commands that should be what a school dedicates themselves to. He Duels Alexis.