第7話: 無限山でジョーとゴマモンがユニモンと対峙し、タイとソラが救援に到着する

When Tai and Matt argue whether they should climb Infinity Mountain to get a better view of their surrounding, Joe and Gomamon decide to climb the mountain by themselves. While on the mountain, they are attacked by Unimon. Tai and Sora come to the rescue, and Gomamon evolves into Ikkakumon to save Joe from falling after Unimon bucked him off and destroy the Black Gear that was controlling Unimon. The three soon reach the peak and learn they are on an island. (Source: Wikipedia)

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