Yu-Gi-Oh! GX Episode 138: Descent of supreme king - The death duelists
Episode 138 of 180 of Yu-Gi-Oh! GX, aired May 30, 2007, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Jim and Axel come across a village under siege by the army of the Supreme King. After seeing the destruction caused by the Dark Army, Jim challenges the king, but becomes shocked when he learns who he really is. Jaden is the Supreme King.