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| image name = PreviewZEXAL21.jpg
| image caption =
| english = Recycling Madness
| kanji = 遊馬VSお掃除ロボットオボミ
| ruby japanese =
| episode number = 21
| japanese air date = August 29, 2011
| english air date = April 28, 2012
| japanese opening = [[Masterpiece]]
| japanese ending = [[My Quest]]
