Digimon Adventure 02: Revenge of Diaboromon

Diablomon was not completely destroyed by Omegamon. He revived, and sending Kuramon into the real world as well as personal pictures of Yamato and Taichi to the internet. So, Taichi and Yamato head back to the Internet to deal with him with Omegamon, while the younger Chosen Children go to deal with the swarm of Kuramon.

Synopsis from Anime News Network