: The children encounter Valdurmon's spirit, which explains the history of a massive ancient war between light and dark Digimon.
The reboot episode takes a more lore-heavy approach, focusing on the history of the Digital World and the underlying conflict. :
Izzy (Koushiro) wanders off to investigate the machinery and finds a secret room with a large power source.
Andromon, a powerful Ultimate-level machine Digimon, is infected by a Black Gear and attacks the children.
: Attempting to defend Izzy, Tentomon digivolves for the first time into his Champion form, Kabuterimon , and uses his "Electro Shocker" (Mega Blaster) to destroy the Black Gear controlling Andromon.
In this classic episode, the children discover a mysterious "factory" where Digimon are being manufactured and powered by mysterious batteries. :