When the boundaries between the human and Digital Worlds begin to intersect, the DigiDestined return to the Digital World to face the Dark Masters, who have each taken control of a part of the Digital World. In the midst of their battles, they learn that they were chosen to save the human and Digital Worlds from encountering Digimon in the human world four years ago. However, tension leads to infighting within the group and causes them to temporarily separate. After reflecting, the DigiDestined reunite to defeat Piedmon, the last Dark Master, and confront Apocalymon, who attempts to destroy both worlds. Apocalymon destroys their Crests, but the DigiDestined realize the power of their Crests were inside them all along and use them to defeat him. With the Digital World restored, Tai and his friends leave their Digimon partners behind and return to their normal lives.