Yu-Gi-Oh! Episode 12: Black Flame! Red-Eyes B. Dragon
Episode 12 of 224 of Yu-Gi-Oh!, aired July 4, 2000, 25 minutes. Available with English subtitles and dub where released.
Episode summary
Joey duels valiantly, but Rex has unleashed his secret weapon: the Red Eyes Black Dragon. Joey must figure out the secret of the Time Wizard card given to him by Yugi, or face defeat and the end of his hopes of helping his sister, Serenity.