Highlights of episodes 1-3 with a lot of things from episode 4 onwards. The interesting stuff starts at 8:45 in the video: youtu.be/KAUXXNkmsNs?t=525
The Digital World is initially set in prehistoric times (rebooted by "the battle from ancient times", perhaps)? Koushirou and Tentomon get swallowed by Whamon and Kabuterimon is formed later We'll be getting some explanation about "the battle from ancient times" in which Patamon and Tailmon participated. Should also explain those mysterious feathers Takeru and Hikari received in episode 2. Cherubimon (Virtue), Seraphimon, Ofanimon, SlashAngemon and Rasielmon are among those involved in said battle.
