Kabuterimon's Electro Shocker

Kabuterimon's Electro Shocker is the fifth episode of both Digimon Adventure and the Digimon Anime series.

Summary
The kids come upon an odd factory that manufactures useless machinery but also produces power. They find Andromon trapped in the factory, and he attacks them when they free him. Agumon and Gabumon evolve into Greymon and Garurumon to fight Andromon, but they're defeated. Tentomon digivolves to Kabuterimon and attacks Andromon's wounded leg, dislodging a Black Gear. Restored to his normal, good self, Andromon directs the kids to a tunnel that leads out of the factory.

Digivolutions

 * Tentomon to Kabuterimon