HARPOON TORPEDO
(Episode 7)

The kids are trying to decide whether they should climb a mountain to get a view of the island, but while they argue, Joe decides to climb it by himself.  

Sora, Tai and Birdramon show up to help, but when Birdramon is
knocked out, Gomamon digivolves to Ikkakumon and uses his Harpoon Torpedo attack to destroy the Black Gear.  

Unimon flies off, and the kids climb to the top of the mountain and see that there are no other islands in sight.