Ep. 21: Yuugi dan Jonouchi mengalahkan Penjaga Gerbang untuk mendapatkan chip bintang bagi kastil Pegasus

In a bid to defeat the Gate Guardian, Yuugi uses Fusion on his Demon's Summon and Jonouchi's Red Eyes Black Dragon, creating the Black Demons Dragon. The tremendous power of the Black Demons Dragon destroys the Gate Guardian. Defeating the Meikyuu Brothers, thus giving Yuugi and Jonouchi the star chips needed to enter into Pegasus' castle. Meanwhile, Kaiba is able to find Mokuba from within his search, but the reunion is soon cut short when Pegasus suddenly appears and uses his Millennium Eye to steal Mokuba's soul. After doing so, Pegasus then gives Kaiba an ultimatum, if he's to duel Pegasus in order to win back Mokuba's soul, Kaiba must first defeat Yuugi in a duel. (Source: Wikipedia, modified)

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