Now Apocalymon

Now Apocalymon is the fifty-third episode of both Digimon Adventure and the Digimon anime series.

Summary
With the appearance of a new enemy, Apocalymon, the chosen children find one last battle. They were outmatched by the power of Apocalymon. Apocalymon degenerates all digimon into the rookie level and destroyed the crests to prevent digivolution. Apocalymon then sends the children to the binary world. While in the binary world, the chosen children find out that the crests weren't needed to digivolve. They digivolve their digimon and return to the digital world to fight Apocalymon one last time.