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| english = Double Trouble Duel - Part 3
| kanji = 悪魔竜！ ブラック・デーモンズ・ドラゴン
| romaji = Akuma ryuu! Burakku Deemonzu Doragon | japanese translated = Evil Demon Dragon! Black Demons Dragon
| episode number = 21
| japanese air date = September 12, 2000
}}
'''Double Trouble Duel - Part 3''', known as '''Evil Demon Dragon! Black Demons Dragon''' in the Japanese version is the twenty-first episode of [[Yu-Gi-Oh! (second series anime)|Yu-Gi-Oh! second series anime]].
==Summary==