Ikkakumon's Harpoon Torpedo

As Joe begins to feel responsible for the group's safety, he decides he must explore the surrounding area by himself, and ends up in trouble when a nearby Unimon is struck by a black gear.

thumb|225px|left|Episode recap for Ikkakumon's Harpoon Torpedo.

Synopsis
The kids find themselves walking through some cold weather, and consider finding a cave they can sleep in. To their relief, there are some hot springs straight ahead, and strangely enough, a fridge full of eggs. After eating, Tai suggests climbing the nearby Infinite Mountain to get a better view of the area, but Matt argues that it would be much too dangerous. Joe prevents a fight breaking out between the two, but the matter remains undecided. So, while everyone is asleep, Joe goes off towards the mountain on his own, followed quickly by Gomamon. Whilst up there, the pair see the Digimon Unimon, who is struck by a black gear. At that moment, Tai and Sora arrive on the scene to help. Joe attempts to remove the gear himself, and Gomamon ends up rescuing him by becoming Ikkakumon.

Dubbing changes

 * Gomamon's dialogue at the beginning of the episode only features in the English dub. The original episode features no dialogue at this point.

Miscellaneous trivia

 * Ikkakumon announces the episode title in the Japanese episode.
 * This is the first time Infinite Mountain is menioned.
 * The group recall that this is their fourth day in the digital world (as far as they know). The first three episodes of the series take place on the first day, the fourth episode takes place on the second day, and the fifth and sixth episodes take place on the third day.