BIYOMON GETS FIREPOWER (Episode 4) 

The kids follow telephone lines to the village of Yokomon at the foot of Mt. Miharashi, a volcano guarded by the flaming Meramon. When Meramon is hit by a flying Black Gear, he becomes violent and attacks the village. 

The Digimon try to stop him and save the Yokomon, but their powers are useless against his fireballs.  Everyone runs to a ship that is in an empty lake (Meramon evaporated the water).

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Sora looks around and realizes Biyomon is far behind helping the Yokomon.  Sora goes after her and catches her when Meramon blasts her down the lake.  

Biyomon and the other digimon attack Meramon, but with each attack, Meramon grows bigger!

Biyomon, realizing that Sora is in danger, digivolves to the firebird Birdramon and drives the Black Gear out of Meramon, bringing him under control.

They all return to the village.  Meramon apologizes about attacking them and is forgiven because it wasn't really his fault.  Meramon returns to Mt. Miharashi.