Digimon Frontier 02: The Revival of ZeedMillenniummon

Prologue:

After the digidestined had destroyed Lucemon and his minions, the Digital World fell into an era of peace and stability called the Golden Age.

Patamon, Lopmon and Salamon grew up together as best friends and digivolved into Lord Seraphimon, Lord Cherubimon and Lady Ophanimon after which they granted their friends, Bokomon and Neemon, an Honorary Knighthood making them Sir Bokomon and Sir Neemon.

But an evil spirit, who is being revived, starts causing chaos and its goal is to become the Supreme Emperor of the Digital World. To stop the problem, the digidestined a.k.a. The Legendary Warriors are called in to destroy this spirit and restore peace to the Digital World once again.