Digimon Adventure Episode - 5

The reboot episode takes a more lore-heavy approach, focusing on the history of the Digital World and the underlying conflict. :

In this classic episode, the children discover a mysterious "factory" where Digimon are being manufactured and powered by mysterious batteries. : Digimon Adventure Episode 5

The group finds a factory on a seemingly uninhabited island. The reboot episode takes a more lore-heavy approach,

Izzy (Koushiro) wanders off to investigate the machinery and finds a secret room with a large power source. Izzy (Koushiro) wanders off to investigate the machinery

: The children encounter Valdurmon's spirit, which explains the history of a massive ancient war between light and dark Digimon.

: They learn their goal is to find the "Holy Digimon" to prevent the dark forces from invading both worlds.

: Soundbirdmon are introduced as a new twist on the "Black Gear" formula, manipulating other Digimon like Dokugumon.